Nedriggingen begynner etter at hittegodset er hentet fra sanitetsteltet.

Nedriggingen is a noun meaning the dismantling, the takedown, or the packing-down.

It is built from:

• å rigge ned = to dismantle / take down / pack up
• nedrigging = dismantling / takedown
• nedriggingen = the dismantling / takedown

So the ending -en is the definite article attached to the noun. Norwegian often puts the at the end of the word instead of using a separate word.

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

Here:

• hittegods = lost property / lost-and-found items
• hittegodset = the lost property

This is very normal in Norwegian. Where English might use several words, Norwegian often prefers one compound word.

Hittegods is the standard Norwegian word for lost property, meaning items that someone has lost and that have been found by someone else.

It is usually treated as a collective noun, much like English lost property or lost and found items. In this sentence, hittegodset refers to the specific lost property being talked about.

For the same reason: it is a compound noun.

It consists of:

• sanitet = medical aid / first aid / sanitary or health services
• telt = tent
• sanitetstelt = medical tent / first-aid tent
• sanitetsteltet = the medical tent

Again, Norwegian strongly prefers compounds here.

Etter at means after when it introduces a whole clause.

Compare:

• etter konserten = after the concert
• etter at konserten er ferdig = after the concert is finished

In your sentence, what comes after etter at is a full clause:

• hittegodset er hentet fra sanitetsteltet

So etter at is exactly the right choice.

Because er hentet is a passive/resultative-style construction here.

• har hentet usually means has collected/picked up and normally needs someone who did the action:
  • Hun har hentet hittegodset = She has collected the lost property.

But in your sentence, the focus is not on who collected it. The focus is on the fact that the lost property has been collected.

So:

• hittegodset er hentet = the lost property has been collected / is collected

This is a very common Norwegian way to express that something has been done, especially when the agent is unknown or unimportant.

In this sentence, yes, that is usually the best way to understand it.

Literally, er hentet looks like is collected, but in context it often means:

• has been collected
• has been picked up

So it describes a completed action with present relevance: the dismantling starts only once that collection is done.

Because this part is a subordinate clause introduced by etter at.

In Norwegian:

• Main clauses often have verb-second word order.
• Subordinate clauses usually have subject + verb order.

So:

• Main clause: Nedriggingen begynner ...
• Subordinate clause: etter at hittegodset er hentet ...

That is why you get:

• hittegodset er hentet not
• er hittegodset hentet

Because the sentence refers to specific, known things in a specific situation:

• nedriggingen = the takedown of this event/setup
• hittegodset = the lost property in question
• sanitetsteltet = the medical tent at this event

Norwegian often marks definiteness by adding an ending:

• -en for many masculine/feminine nouns
• -et for many neuter nouns

So instead of separate the, Norwegian usually attaches definiteness directly to the noun.

Fra means from.

In this sentence it shows the place the lost property is being collected from:

• fra sanitetsteltet = from the medical tent

So it tells you the source or location the item is taken from.

You could, but it would sound more general and less natural in this context.

Compare:

• Nedriggingen begynner ... = The takedown begins ...
• Nedrigging begynner ... = Takedown/dismantling begins ... (more general, less tied to a specific event)

Because this sentence is about a particular event setup being taken down, the definite form nedriggingen is the most natural choice.

It is natural and fairly neutral Norwegian. It sounds like something you might see in:

• event information
• festival instructions
• public announcements
• volunteer or staff communication

Words like hittegods, sanitetstelt, and nedrigging are especially common in organized-event contexts.

Yes. A version with blitt is also possible:

• ... etter at hittegodset er blitt hentet fra sanitetsteltet.

This is a more explicit passive meaning has been collected.

However, er hentet is very natural and often preferred because it is shorter and smoother. Both can work, but er hentet is very common in exactly this kind of sentence.