Bibliotekarka powiedziała, że ten autor napisał też ciekawy wiersz dla dzieci.

Bibliotekarka means female librarian. The noun bibliotekarz is male librarian, and bibliotekarka is the regular feminine counterpart.

So:

• bibliotekarz = male librarian
• bibliotekarka = female librarian

In this sentence, the speaker is clearly referring to a woman, which also matches the past-tense verb powiedziała.

Polish past tense agrees with the subject in gender as well as number.

Because bibliotekarka is feminine singular, the verb must also be feminine singular:

• powiedział = he said
• powiedziała = she said

So:

• Bibliotekarka powiedziała = The librarian (female) said

This is one of the big differences from English: in Polish, past-tense verbs often show whether the subject is male or female.

Że means that and introduces a subordinate clause.

So the sentence structure is:

• Bibliotekarka powiedziała = The librarian said
• że ten autor napisał też ciekawy wiersz dla dzieci = that this author also wrote an interesting poem for children

This works much like English that in:

• She said that...

In Polish, że is extremely common after verbs like:

• powiedzieć = to say
• myśleć = to think
• wiedzieć = to know
• sądzić = to believe / think

In Polish, a subordinate clause introduced by words like że is normally separated by a comma.

So:

• Bibliotekarka powiedziała, że...

This is standard Polish punctuation. English sometimes omits that, but Polish normally keeps że here, and the comma is expected.

Ten means this or sometimes that particular in context.

So ten autor means:

• this author
• or that author in the sense of the one we’re talking about

Polish often uses demonstratives like ten / ta / to more naturally than English does. In English, we might simply say the author, but Polish may use ten autor to point to a specific person already known in the conversation.

Because autor is masculine singular, the correct form is:

• ten for masculine
• ta for feminine
• to for neuter

This is about aspect, which is very important in Polish.

• pisać = imperfective, to write, focusing on the process, repetition, or ongoing action
• napisać = perfective, to write in the sense of finish writing / produce a completed text

So:

• napisał wiersz = he wrote a poem / he finished writing a poem
• pisał wiersz = he was writing a poem / he used to write poems

In this sentence, the idea is that the author completed the poem, so napisał is the natural choice.

There are two clues:

1. autor is a masculine noun
2. The past-tense verb is napisał, which is masculine singular

Compare:

• autor napisał = the male author wrote
• autorka napisała = the female author wrote

So this sentence is specifically about a male author.

Ciekawy wiersz is in the accusative singular, because it is the direct object of napisał.

However, for many masculine inanimate nouns, the accusative singular looks the same as the nominative singular.

So:

• nominative: ciekawy wiersz
• accusative: ciekawy wiersz

That is why nothing changes here.

The adjective ciekawy agrees with wiersz in:

• gender: masculine
• number: singular
• case: accusative

Because wiersz is a masculine inanimate noun, and in Polish the accusative singular often matches the nominative singular for that type of noun.

So:

• nominative: wiersz
• accusative: wiersz

If it were a masculine animate noun, you would often see a different accusative form.

For example:

• Widzę autora = I see the author
  Here autor changes to autora in the accusative because it is masculine animate.

But:

• Napisał wiersz = He wrote a poem
  No visible change, because wiersz is masculine inanimate.

Też means also or too.

Here:

• napisał też ciekawy wiersz = also wrote an interesting poem

Its position is fairly flexible, but the emphasis can shift a little depending on where it appears.

For example:

• Ten autor też napisał ciekawy wiersz = This author also wrote an interesting poem
  (the author, too, did this)
• Ten autor napisał też ciekawy wiersz = This author also wrote an interesting poem
  (in addition to something else he wrote)
• Ten autor napisał ciekawy wiersz też dla dzieci would sound odd for this meaning and could suggest the for children part is what is being added

So the sentence’s placement of też is natural and probably means the author wrote this poem in addition to something else.

The preposition dla requires the genitive case.

So:

• dla = for
• dzieci = children, here in the genitive plural

The full phrase:

• dla dzieci = for children

A useful thing to remember is that dziecko (child) is an irregular noun.

Some important forms are:

• singular nominative: dziecko
• plural nominative: dzieci
• plural genitive: dzieci

So in this phrase, the form dzieci happens to look the same as nominative plural, but its function here is genitive because of dla.

Usually yes: wiersz means poem.

A few helpful related words:

• wiersz = poem
• poezja = poetry
• poeta = poet
• wierszyk = little poem / short rhyme, often for children

Since the sentence says ciekawy wiersz dla dzieci, it could refer to a children’s poem, rhyme, or verse piece, but the normal translation is simply an interesting poem for children.

Yes. Polish word order is more flexible than English because case endings carry a lot of grammatical information.

The given sentence is natural:

• Bibliotekarka powiedziała, że ten autor napisał też ciekawy wiersz dla dzieci.

But other orders are possible, for example:

• Bibliotekarka powiedziała, że też ten autor napisał ciekawy wiersz dla dzieci.
• Bibliotekarka powiedziała, że ciekawy wiersz dla dzieci ten autor też napisał.

These alternatives may sound more marked, literary, or emphasize different parts of the sentence.

For learners, the original version is the best one to imitate because it sounds neutral and natural.

Yes, wiersz is a tricky word for English speakers.

A rough guide:

• wie sounds a bit like vye / vyer
• rz usually sounds like the zh sound in measure

So wiersz is approximately like vyersh or vyesh, depending on accent and speed.

Also:

• w in Polish sounds like English v
• rz usually sounds like ż
• consonant clusters are common in Polish, so this word may take practice

It is best learned by listening and repeating, because English spelling doesn’t match Polish sounds very well here.