Saksbehandleren satte et stempel på kopien og sa at alt nå var i orden.

Because -en is the definite singular ending for many Norwegian nouns.

• saksbehandler = case handler / case officer / administrator
• saksbehandleren = the case handler / the case officer

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

So:

• en saksbehandler = a case handler
• saksbehandleren = the case handler

It is a very common administrative word in Norwegian. A saksbehandler is the person who deals with a case, application, file, or official matter.

Depending on context, it could be translated as:

• caseworker
• case officer
• administrator
• official handling the case

In government or office contexts, case officer or caseworker is often a good fit.

Satte is the past tense of sette.

• å sette = to put / to place / to set
• setter = puts / is putting
• satte = put / placed
• har satt = has put / has placed

So satte et stempel på kopien means that the person physically put or stamped a stamp on the copy.

This verb is very common, and it is irregular, so you just need to learn the form:

• sette → satte

Because stempel is a neuter noun in Norwegian.

Norwegian nouns have grammatical gender. In Bokmål, the two main article patterns are:

• en for common gender
• et for neuter

So:

• et stempel = a stamp
• stempelet = the stamp

You simply have to learn the gender with the noun.

Because the sentence introduces the stamp as an item, not a specific previously known stamp.

Compare:

• satte et stempel på kopien = put a stamp on the copy
• satte stempelet på kopien = put the stamp on the copy

The indefinite form et stempel is natural here because the important idea is that a stamp was applied, not which exact stamp it was.

Kopien means the copy. The definite form is used because this is a specific copy already known in the situation.

• en kopi = a copy
• kopien = the copy

So the sentence is talking about a particular copy that both speaker and listener can identify.

Also, på is the normal preposition here:

• på kopien = on the copy

It does not have to. In Norwegian, just like in English, when two verbs share the same subject and are joined by og (and), the subject is often stated only once.

So:

• Saksbehandleren satte et stempel på kopien og sa ...

means:

• The case officer put a stamp on the copy and said ...

The subject saksbehandleren applies to both verbs:

• satte
• sa

You could repeat it, but that would usually sound unnecessary.

Sa means said, and at means that.

So:

• sa at ... = said that ...

This is the standard way to introduce reported speech or reported information in Norwegian.

Examples:

• Han sa at han var trøtt. = He said that he was tired.
• Hun sa at alt var klart. = She said that everything was ready.

Just like in English, that can sometimes be omitted in informal speech, but at is very normal and clear.

After at, you get a subordinate clause, and Norwegian subordinate clauses have different word order from main clauses.

Here the structure is:

• at
  • subject
    • adverb
      • verb

So:

• at alt nå var i orden

Breakdown:

• at = that
• alt = everything
• nå = now
• var = was
• i orden = in order / okay

This placement of nå is very natural. Norwegian often puts adverbs like this before the finite verb in subordinate clauses.

Because the whole sentence is in the past, and this clause is being reported from that past moment.

• sa = said
• var = was

So the sentence presents what was true at that time: everything was now in order.

This is similar to English backshifting in reported speech:

• He said that everything was in order.

That said, Norwegian is sometimes a bit flexible with tense in reported speech. If something is still true now, you may sometimes see present tense in other contexts. But here var is the most natural choice.

I orden is a fixed expression meaning:

• in order
• okay
• all right
• correct / sorted out

So alt nå var i orden means that everything was now okay or properly settled.

There is no article because this is an idiomatic expression, not a literal noun phrase like in the order.

Other common expressions with orden include:

• Det er i orden. = That is okay.
• Få orden på noe. = Get something in order / sort something out.

Yes, nå means now, but here it means now at that point in the situation.

So the sense is:

• after the stamp was put on the copy, the case officer said that everything was now in order

It marks a change of state: before, things were not fully settled; after this action, they were.

Yes, it is a very natural way to say it.

• sette et stempel på kopien = put a stamp on the copy
• stemple kopien can also mean stamp the copy

So Norwegian can express this idea in more than one way:

• satte et stempel på kopien
• stemplet kopien

The version in your sentence is slightly more explicit because it mentions a stamp as a noun.

It has three main parts:

1. Saksbehandleren
   the subject

2. satte et stempel på kopien og sa
   two coordinated past-tense verbs with the same subject:

   • satte
   • sa

3. at alt nå var i orden
   a subordinate clause explaining what was said

So the sentence pattern is basically:

• [Subject] + [verb 1] + and + [verb 2] + [that-clause]

That makes it a very useful model sentence for learning both coordination and reported speech in Norwegian.