Formålet er å gjennomføre tiltaket for målgruppen.

Because formålet is the definite singular form of the neuter noun et formål. In Norwegian, definiteness is usually added to the end of the noun instead of using a separate word like the.

• et formål = a purpose
• formålet = the purpose

So -et here is doing the job that the does in English.

Norwegian usually builds the into the noun itself.

In this sentence:

• formålet = the purpose
• tiltaket = the measure / the action / the initiative
• målgruppen = the target group

This is very normal in Norwegian. English uses a separate article; Norwegian often uses an ending.

Here å is the infinitive marker, the equivalent of English to.

• å gjennomføre = to carry out / to implement

After er, Norwegian often uses an infinitive phrase to say what the purpose, goal, plan, or intention is:

• Formålet er å ... = The purpose is to ...

So the structure is very close to English.

Gjennomføre is a fairly formal verb. In this kind of sentence, it usually means carry out, implement, or complete.

It is common in official, academic, and administrative language, especially with words like tiltak. So gjennomføre tiltaket is a very typical formal phrase meaning something like carry out the measure/action or implement the initiative.

Because the sentence refers to a specific measure/action, not just any measure in general.

• et tiltak = a measure / an action / an initiative
• tiltaket = the measure / the action / the initiative

Using tiltaket suggests that this measure has already been mentioned, is known from context, or is being treated as a specific planned item.

Here for means for the benefit of, intended for, or aimed at the target group.

So tiltaket for målgruppen means the measure is meant for that group. English uses for in a very similar way here.

A learner might expect til, but til more often suggests direction, movement, or transfer. In this sentence, for is the natural choice because the focus is on who the measure is intended for.

Because in Bokmål, many feminine nouns can take either the -a ending or the -en ending in the definite singular.

So both of these can be possible, depending on style:

• målgruppen
• målgruppa

Målgruppen sounds more neutral and formal, which fits this sentence very well. Målgruppa is also possible in many contexts, but it often feels a bit less formal.

The structure is:

• Formålet = subject
• er = finite verb
• å gjennomføre tiltaket for målgruppen = complement

Inside the infinitive phrase, the order is also very normal:

• å gjennomføre = infinitive verb
• tiltaket = object
• for målgruppen = prepositional phrase

So the sentence follows a straightforward pattern: subject + verb + infinitive phrase.

The sentence does not say. The actor is left unstated.

That is very common in formal Norwegian. The context may make it obvious who is responsible: an organization, a project team, a municipality, a school, and so on.

So å gjennomføre tiltaket tells us what is to be done, but not who will do it.

Yes, it sounds natural, but it is clearly formal and somewhat administrative.

Words like formål, gjennomføre, tiltak, and målgruppe are very common in:

• reports
• project descriptions
• funding applications
• policy documents
• official writing

A more everyday sentence would probably use simpler wording, but for formal written Norwegian, this sentence is completely normal.