Regnskapsføreren kontrollerer omsetningen og driftskostnaden.

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

• en regnskapsfører = an accountant / a bookkeeper
• regnskapsføreren = the accountant / the bookkeeper

In Norwegian, the definite article is often attached to the end of the noun instead of being a separate word like English the.

So this sentence literally looks like:

• regnskapsføreren = accountant-the
• kontrollerer = checks / controls
• omsetningen = turnover/revenue-the
• og = and
• driftskostnaden = operating cost-the

For the same reason: Norwegian usually marks definiteness with an ending on the noun.

• en omsetning → omsetningen
• en driftskostnad → driftskostnaden

So the sentence is talking about specific things: the revenue/turnover and the operating cost.

This is very normal in Norwegian. English uses a separate word (the), but Norwegian often adds the definiteness directly to the noun.

Yes. Kontrollerer is the present tense form of å kontrollere.

• å kontrollere = to check / to inspect / to verify / to control
• kontrollerer = checks / is checking

Norwegian present tense is usually simple because the same form is used with all subjects:

• jeg kontrollerer = I check
• du kontrollerer = you check
• han/hun kontrollerer = he/she checks
• de kontrollerer = they check

Unlike English, the verb does not change depending on the subject.

No, this sentence has the basic normal word order:

Subject + Verb + Object

• Regnskapsføreren = subject
• kontrollerer = verb
• omsetningen og driftskostnaden = object

So it matches English quite closely:

The accountant checks the revenue and the operating cost.

This makes it a very straightforward sentence for an English speaker.

Because Norwegian uses compound nouns very freely, much like German.

Driftskostnaden is built from:

• drift = operation / running
• kostnad = cost
• together: driftskostnad = operating cost

Then the definite ending is added:

• en driftskostnad = an operating cost
• driftskostnaden = the operating cost

The -s- in driftskostnad is a linking element. You will see this a lot in Norwegian compounds, for example:

• arbeidsgiver = employer
• regnskapsfører = accountant/bookkeeper

So long words like this are very normal in Norwegian.

It is made up of:

• regnskap = accounts / accounting
• fører = leader, keeper, person who manages/carries out something

Together, regnskapsfører means something like accounting keeper/manager, which is why it is translated as accountant or bookkeeper.

Then the definite ending is added:

• en regnskapsfører
• regnskapsføreren

So the whole first word means the accountant.

Yes, English often uses the plural operating costs, and Norwegian can also use the plural if that is what is meant:

• driftskostnadene = the operating costs

But Norwegian sometimes uses the singular when referring to a cost figure as one accounting item or category. So driftskostnaden can mean the operating cost as a single figure or total amount.

Which one sounds best depends on context:

• driftskostnaden = one specific cost figure / total operating cost
• driftskostnadene = multiple operating costs / several cost items

So the singular here is not strange.

In business Norwegian, omsetning usually means turnover, revenue, or sales depending on context.

It does not usually mean profit.

So:

• omsetning = money coming in from sales
• fortjeneste or overskudd = profit

This is a useful distinction, because English learners sometimes confuse revenue and profit, and Norwegian keeps them separate too.

A rough English-friendly guide would be:

RENG-skahps-fuh-rer-en

A few things to notice:

• gn in regn- is usually pronounced like ngn or simplified in speech
• å/ø-type sounds can be tricky for English speakers; here fører contains ø, which is not a normal English vowel
• the r is pronounced clearly in many dialects, though pronunciation varies across Norway

You do not need perfect pronunciation right away, but it helps to break the word into parts:

• regnskap
• fører
• -en

Sometimes, yes, but you should be careful.

In this sentence, kontrollerer most naturally means checks, verifies, or reviews.

For example:

• Regnskapsføreren kontrollerer omsetningen = The accountant checks the revenue

But in other contexts, kontrollerer can mean controls in the sense of having power over something:

• Han kontrollerer selskapet = He controls the company

So å kontrollere can mean either to check or to control, depending on context. In accounting or paperwork contexts, check/verify is often the better interpretation.

Usually, yes, it would be wrong in a simple sentence like this.

You normally say:

• regnskapsføreren
• omsetningen
• driftskostnaden

not:

• den regnskapsføreren
• den omsetningen
• den driftskostnaden

Using den is possible in special cases, but then it usually adds emphasis, contrast, or goes together with an adjective:

• den nye regnskapsføreren = the new accountant

This is called double definiteness: Norwegian often uses both a definite article and a definite noun when an adjective is present.

But in your sentence, no extra article is needed.

Yes, this is standard Bokmål Norwegian.

Everything about it looks normal and natural in Bokmål:

• Regnskapsføreren
• kontrollerer
• omsetningen
• driftskostnaden

A learner should treat this as standard written Norwegian.