Tilbakeleveringen skjer før lånetiden slutter.

Because Norwegian very often makes compound nouns by joining words together.

Here, tilbakelevering is made from:

• tilbake = back
• levering = delivery / handing in

So tilbakelevering means something like returning or handing back.

Then -en is added at the end to make it definite, so tilbakeleveringen means the return or the handing back.

This kind of long compound is completely normal in Norwegian.

The ending -en is the definite article attached to the noun.

In English, you usually put the before the noun:

• the return

In Norwegian, the definiteness is often added to the end:

• tilbakelevering = return
• tilbakeleveringen = the return

So Norwegian often expresses the as a suffix instead of a separate word.

Skjer is the present tense of å skje, which means to happen or to take place.

So Tilbakeleveringen skjer ... literally means:

• The return happens ...
• or more naturally, The return takes place ...

This is a fairly formal or administrative way to say it. In everyday language, Norwegian might also use a more direct construction, depending on context, such as:

• Du må levere tilbake før lånetiden slutter = You must return it before the loan period ends

But in notices, rules, and official wording, skjer is very common.

Because Norwegian often uses the present tense for:

• general rules
• schedules
• instructions
• future events that are fixed or expected

So skjer and slutter are present tense forms, but the sentence can still refer to what must happen in relation to a future deadline.

This is similar to English in sentences like:

• The train leaves at 6
• Payment is due tomorrow

So the present tense here does not mean it is happening right now; it can express a rule or requirement.

Før means before.

It introduces a clause:

• før lånetiden slutter = before the loan period ends

So the whole sentence says that the return takes place before the loan period ends.

In Norwegian, før works much like English before, connecting one event to another in time.

Lånetiden means the loan period.

It is a noun made from:

• lånetid = loan period
• lånetiden = the loan period

Again, the -en at the end makes it definite.

This word refers to the period during which something is borrowed, for example a library book.

Because the sentence is talking about a specific loan period: the one connected to the item being borrowed.

So:

• lånetid = a loan period
• lånetiden = the loan period

This is very natural in Norwegian when the context already makes it clear which return and which loan period are being discussed.

Slutter is the present tense of å slutte, which often means to stop or to end.

In this sentence, lånetiden slutter means:

• the loan period ends

So slutter is being used about the end of a period of time.

Depending on context, Norwegian can also use other expressions for this idea, such as:

• går ut = expires / runs out
• utløper = expires

But slutter is understandable and straightforward.

Because Norwegian usually puts the definite article on the end of the noun instead of using a separate word.

So:

• tilbakeleveringen = the return
• lånetiden = the loan period

This is one of the big structural differences between English and Norwegian.

English:

• the return
• the loan period

Norwegian:

• tilbakeleveringen
• lånetiden

Yes. Norwegian often allows both a noun-based style and a verb-based style.

This sentence uses a noun-based, slightly formal style:

• Tilbakeleveringen skjer før lånetiden slutter

A more direct version could be:

• Du leverer tilbake før lånetiden slutter
• Du må levere tilbake før lånetiden slutter

So the original sentence sounds a bit more like a rule, notice, or official statement.

Not especially in this sentence.

The clause after før is:

• lånetiden slutter

That is just normal subject + verb order:

• lånetiden = subject
• slutter = verb

Learners sometimes expect something unusual after words like før, but here the structure is quite simple.

Here it means the action/process of returning something.

So it refers to the act of handing something back, not to the object itself.

That is why skjer fits well:

• The return takes place before ...

If it referred to the item itself, the sentence would not make as much sense with skjer.

It is natural, but it sounds somewhat formal or administrative.

It would fit well in contexts like:

• library rules
• borrowing conditions
• official instructions
• written notices

In casual speech, a Norwegian speaker might choose a more direct sentence with a personal subject, such as:

• Du må levere tilbake boka før lånetiden slutter

So the original sentence is natural, just a bit more official in tone.