Gjenopprettingen og skadebegrensningen er ferdige.

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

• gjenoppretting = recovery / restoration

• gjenopprettingen = the recovery / the restoration

• skadebegrensning = damage limitation / damage control / mitigation
• skadebegrensningen = the damage limitation / the damage control

So both nouns are in the definite singular form.

In Norwegian, definiteness is often marked by a suffix on the noun:

• en bil = a car
• bilen = the car

The same pattern is used here:

• gjenoppretting → gjenopprettingen
• skadebegrensning → skadebegrensningen

So English uses a separate article, but Norwegian often attaches it to the noun.

Because the subject is made up of two things joined by og:

• Gjenopprettingen
• og skadebegrensningen

Together, they form a plural subject: the recovery and the damage control. Because of that, the adjective must be plural too:

• singular: ferdig
• plural: ferdige

So:

• Gjenopprettingen er ferdig = The recovery is finished.
• Skadebegrensningen er ferdig = The damage control is finished.
• Gjenopprettingen og skadebegrensningen er ferdige = The recovery and the damage control are finished.

Because agreement follows the whole subject, not each noun separately.

Each noun by itself is singular, but when you join them with og, Norwegian treats them as a plural group.

Compare:

• Boken er interessant. = The book is interesting.
• Filmen er interessant. = The film is interesting.
• Boken og filmen er interessante. = The book and the film are interesting.

The same thing happens in your sentence.

Ferdig means finished, done, complete, or sometimes ready, depending on context.

In this sentence, ferdige most naturally means:

• finished
• completed
• possibly done

So the sentence is saying that both processes are complete.

It is a noun formed from a verb.

• å gjenopprette = to restore / to recover / to re-establish
• gjenoppretting = restoration / recovery / re-establishment

The ending -ing often makes a noun from a verb, similar to how English can use -ing or a related noun form.

So gjenopprettingen literally means something like the restoration or the recovery.

It is a compound noun:

• skade = damage
• begrensning = limitation / limiting / containment

So skadebegrensning literally means damage limitation. In natural English, depending on context, it could be:

• damage control
• damage limitation
• mitigation of damage

Norwegian uses compound nouns very freely, so seeing long nouns like this is very normal.

Because er is used for both singular and plural in the present tense of å være.

Compare:

• Han er ferdig. = He is finished.
• De er ferdige. = They are finished.

So Norwegian does not change the present-tense verb the way English changes is/are. The number difference is shown elsewhere, such as in the adjective ferdig / ferdige or in the subject itself.

Yes, that can work, but it changes the nuance slightly.

• er ferdige = are finished / are done / are complete
• er fullført = are completed / have been completed

Fullført can sound a bit more formal or task-oriented, while ferdige is very common and natural for saying something is done.

However, if you use fullført, be careful with agreement depending on style and structure. Many learners find ferdige easier and more straightforward here.

Yes. This is standard word order for a simple statement:

• Subject: Gjenopprettingen og skadebegrensningen
• Verb: er
• Predicative adjective: ferdige

So the structure is:

[subject] + [verb] + [description]

That is very normal in Norwegian.

Usually not in this structure. Since both nouns are definite, both normally carry their own definite form:

• gjenopprettingen og skadebegrensningen

This is the natural way to say the recovery and the damage control.

Norwegian does not usually say something equivalent to the recovery and damage control if both are meant as definite and parallel nouns in this kind of formal sentence.

Then you would remove the definite endings:

• Gjenoppretting og skadebegrensning er ferdige.

That would mean something like Recovery and damage control are finished in a more general or less specifically identified sense.

But in your original sentence, the definite forms suggest that these are specific, known processes or efforts.

Yes, it is grammatical and natural, especially in formal, technical, administrative, or news-like contexts.

It sounds like something you might read in:

• an incident report
• a status update
• emergency management communication
• IT/service restoration context

The nouns are fairly formal, so the whole sentence has a formal tone rather than a casual everyday one.