Mkutubi wa shule alituletea kamusi mpya na kutuonyesha jinsi rejesta ya maktaba inavyotumika.

Literally, it means librarian of the school. In natural English, that is the school librarian.

The word wa is a linking word often translated as of. It changes form depending on the noun class of the first noun. Here, mkutubi is a singular human noun, so the linker is wa.

So: Mkutubi wa shule = the school’s librarian / the school librarian

Swahili often packs a lot of information into one verb word.

alituletea can be broken down like this:

a- = he/she
-li- = past tense
-tu- = us
-letea = bring to/for

So the whole word means something like he/she brought to us.

This is very normal in Swahili. Subject markers, tense markers, object markers, and verb extensions are usually all attached to the verb.

kuleta means to bring.

kuletea means to bring to someone or to bring for someone.

That extra -ea adds the idea of a recipient or beneficiary. In this sentence, the librarian did not just bring a dictionary in general; the librarian brought it to us.

This is an important difference:

alituletea kamusi = he/she brought us a dictionary
alituleta = he/she brought us

So -ea really matters.

After one finite verb, Swahili often uses the infinitive ku- form for another action with the same subject.

So:

alituletea ... na kutuonyesha ...
means
he/she brought us ... and showed us ...

This is a very natural way to link actions when the subject stays the same. You could say na alituonyesha, but repeating the full subject marker and tense marker sounds heavier and is often unnecessary.

No. Swahili verbs do not normally mark gender in this way.

a-li- simply means he/she did in the past. The same verb form can refer to a man or a woman.

So alituletea could mean: he brought us or she brought us

You need context to know which one is meant.

In Swahili, adjectives usually come after the noun.

So: kamusi mpya = new dictionary

The adjective has to agree with the noun class of kamusi. Kamusi belongs to the N-class group, and the adjective stem -pya becomes mpya with that class.

So: kamusi mpya = new dictionary
not mpya kamusi

Yes. They are related.

kuona = to see
kuonyesha = to show

A helpful way to think about kuonyesha is to make someone see. That is why it means to show.

So in kutuonyesha: ku- = infinitive
-tu- = us
-onyesha = show

Together: to show us

jinsi means how or the way.

It introduces an explanation of manner or method.

So: jinsi rejesta ya maktaba inavyotumika means how the library register is used or the way the library register is used

It is a very common word when explaining procedures, methods, or manners of doing something.

Because the linking word agrees with the first noun, not the second one.

In mkutubi wa shule, the first noun is mkutubi, which is a singular human noun, so the linker is wa.

In rejesta ya maktaba, the first noun is rejesta, which takes the linker ya.

So:

mkutubi wa shule = librarian of the school
rejesta ya maktaba = register of the library

This is a very common Swahili pattern.

inavyotumika can be broken down like this:

i- = it, referring to rejesta
-na- = present tense
-vyo- = a relative element meaning how / the way in which in this kind of construction
-tumika = be used / function

So inavyotumika means how it is used or the way it is used.

The important part here is -vyo-. After jinsi, Swahili often uses this form to express manner: jinsi ... inavyotumika = how ... is used

If you just said inatumika, that would mean it is used or it functions, but it would not carry the same how/the way idea.

kutumia means to use.
kutumika means to be used, to function, or to be in use.

In this sentence, the focus is on the register and the manner in which it is used, not on a specific person doing the using. That is why kutumika fits well.

Compare:

jinsi rejesta inavyotumika = how the register is used
jinsi wanavyotumia rejesta = how they use the register

Both can make sense, but they focus on the idea differently.

Swahili usually does not have separate words for the and a/an.

Whether something is definite or indefinite is usually understood from context.

So: mkutubi wa shule can mean the school librarian kamusi mpya can mean a new dictionary or the new dictionary, depending on context

In this sentence, the context makes the meaning clear without articles.

Swahili has borrowed many words from other languages over time, especially Arabic, English, and others. That is completely normal and a major part of the language’s history.

In this sentence: rejesta comes from register maktaba comes from Arabic and means library kamusi also comes from Arabic and means dictionary

Even when a word is borrowed, it still behaves like a Swahili word in grammar. For example, it takes Swahili agreement patterns and fits into Swahili sentence structure.