Post la nokta vento nia najbarino rimarkis, ke la tegmento rompiĝis en unu loko, sed neniu vundiĝis.

Post is the normal preposition for after in Esperanto.

So:

• post la nokta vento = after the night wind

Poste is an adverb meaning afterward / later, not a preposition. So you can say:

• Poste nia najbarino rimarkis... = Afterward our neighbor noticed...

But if you want to say after + a noun phrase, you use post, not poste de.

Nokta is the adjective form of nokto (night).

• nokto = night
• nokta = nightly, night-, of the night

So la nokta vento literally means the night wind or the wind during the night.

This is very common in Esperanto: a noun can become an adjective with -a.

Examples:

• tago = day → taga = daily, day-
• somero = summer → somera = summer, summer-

In Esperanto, a possessive like mia, via, nia, ŝia usually takes the place of la.

So:

• la tegmento = the roof
• nia najbarino = our neighbor

You normally do not say la nia najbarino.

This is similar to English: we say our neighbor, not the our neighbor.

Najbaro means neighbor.

The suffix -in- marks female sex, so:

• najbaro = neighbor
• najbarino = female neighbor

The final -o is the noun ending, so the word is built like this:

• najbar- = neighbor root
• -in- = female
• -o = noun

A learner might also wonder whether najbaro is always male. In modern Esperanto, najbaro is often used as a general word for neighbor, while najbarino specifically means a female neighbor.

Because -is is the Esperanto ending for the past tense.

• rimarki = to notice
• rimarkas = notices / is noticing
• rimarkis = noticed
• rimarkos = will notice

So nia najbarino rimarkis means our neighbor noticed.

In Esperanto, subordinate clauses are very often separated by commas, and that includes clauses introduced by ke (that).

So:

• nia najbarino rimarkis, ke...
  = our neighbor noticed that...

This comma is more regular in Esperanto than in English, where the comma before that is often omitted.

Ke introduces a content clause, usually translated as that.

So:

• rimarkis, ke la tegmento rompiĝis...
• noticed that the roof broke / was damaged...

It connects the main clause to what was noticed.

A very literal breakdown is:

• Nia najbarino rimarkis = Our neighbor noticed
• ke la tegmento rompiĝis en unu loko = that the roof broke in one place

This is a very important Esperanto pattern.

• rompi = to break something
• rompiĝi = to become broken / to break

So:

• Li rompis la glason. = He broke the glass.
  (someone actively broke it)

But:

• La glaso rompiĝis. = The glass broke.
  (it became broken)

In your sentence:

• la tegmento rompiĝis = the roof got broken / broke

This does not focus on who caused it. It describes a change of state.

The suffix -iĝ- often means to become or to get into a state.

So:

• rompi = break something
• rompiĝi = become broken

and:

• vundi = injure someone
• vundiĝi = become injured / get injured

In this sentence:

• la tegmento rompiĝis = the roof became broken
• neniu vundiĝis = nobody became injured

This is one of the most useful suffixes in Esperanto.

Not necessarily.

Rompiĝi means that the subject ended up broken. It does not always mean there was no cause at all. The cause may be obvious from context, or simply left unstated.

Here, the likely cause is la nokta vento, but Esperanto still uses rompiĝis because the sentence describes what happened to the roof, not who performed the action.

So it is better to think of rompiĝi as:

• to become broken
• to get broken

rather than strictly to break by itself.

Word by word:

• en = in
• unu = one
• loko = place

So en unu loko literally means in one place or at one spot.

In natural English here, that could also be understood as:

• in one area
• at one point
• in one part

It tells us the damage was limited to a single spot on the roof.

Because unu specifically means one, while iu means some / a certain.

Compare:

• en unu loko = in one place
• en iu loko = in some place / in a certain place

In this sentence, unu emphasizes that there was exactly one damaged spot.

Because neniu refers to no person / nobody, while nenio means nothing.

So:

• neniu = no one, nobody
• nenio = nothing

Since injury applies to people here, neniu vundiĝis means:

• nobody got hurt

If you said nenio vundiĝis, that would mean nothing got injured, which sounds odd in this context.

Both are possible, but they focus slightly differently.

• neniu vundiĝis = nobody got injured
• neniu estis vundita = nobody was injured

The -iĝ- form is often very natural when talking about something that happened to someone.

It emphasizes the change into the injured state:

• vundiĝi = to get injured

The passive form estis vundita is also correct, but it can sound a little more formal or more focused on the resulting state.

Yes, Esperanto word order is fairly flexible.

The sentence begins with Post la nokta vento to set the time/context first:

• After the night wind, our neighbor noticed...

That is very natural.

You could also say:

• Nia najbarino rimarkis post la nokta vento, ke...

But the original order is smoother because it introduces the situation before the main action.

Esperanto often places time expressions early in the sentence, just like English often does.

Sed means but.

It connects two ideas in contrast:

• the roof was damaged in one place
• nobody was injured

So:

• ..., sed neniu vundiĝis.
• ..., but nobody got hurt.

This is a very common coordinating conjunction in Esperanto.

Yes. It follows a very normal pattern:

1. Time phrase
   • Post la nokta vento
2. Main clause
   • nia najbarino rimarkis
3. Subordinate clause with ke
   • ke la tegmento rompiĝis en unu loko
4. Contrasting clause
   • sed neniu vundiĝis

So the sentence is a good example of ordinary Esperanto prose: clear, compact, and built from very regular grammar.