Donasjonsavtalen gjelder i matbransjen.

Because Norwegian normally writes compound nouns as one single word.

So:

• donasjon = donation
• avtale = agreement

Together they form donasjonsavtale = donation agreement.

This is much more normal in Norwegian than writing separate words. Writing it as two words would usually look wrong to a native reader.

That s is a very common linking sound/letter in Norwegian compounds.

So the structure is:

• donasjon
• • s
• • avtale
• = donasjonsavtale

This -s- does not have a separate meaning by itself here. It just helps connect the two parts in a way that sounds natural in Norwegian.

You will see this a lot in compound nouns, but not every compound uses it.

The ending -en makes the noun definite singular.

Compare:

• en donasjonsavtale = a donation agreement
• donasjonsavtalen = the donation agreement

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

For the same reason: it is also in the definite singular form.

Breakdown:

• mat = food
• bransje = industry/sector/line of business
• matbransje = food industry
• matbransjen = the food industry

Again, Norwegian usually adds the definite ending directly to the noun.

Here gjelder means something like:

• applies
• is valid
• concerns

It is the present tense of å gjelde.

This verb is very common in formal or factual language. It is often used for rules, agreements, laws, exceptions, and similar things.

For example:

• Regelen gjelder alle. = The rule applies to everyone.
• Dette gjelder bare voksne. = This only applies to adults.

In your sentence, gjelder suggests that the agreement is relevant or applicable within that area.

I usually means in here, so it places the agreement within the food industry as an area or field.

So i matbransjen means:

• in the food industry
• within the food sector

This is natural because bransje is thought of as a field or sector, and Norwegian often uses i with those.

Yes, but it would change the nuance.

• Donasjonsavtalen gjelder i matbransjen = the agreement applies in/within the food industry
• Donasjonsavtalen gjelder matbransjen = the agreement concerns/applies to the food industry

So:

• with i, the sentence focuses more on the agreement being valid within that sector
• without i, the sentence sounds more like the agreement is about or directly concerns the food industry

Both can be possible, but they are not exactly the same.

The word order is very straightforward:

• Donasjonsavtalen = subject
• gjelder = verb
• i matbransjen = prepositional phrase

So it follows the normal Norwegian pattern for a simple statement:

subject + verb + other information

This is the same basic order English often uses.

Both avtale and bransje are normally common gender nouns in Bokmål, which is why their definite singular form ends in -en:

• en avtale → avtalen
• en bransje → bransjen

In compounds, the last part usually decides the gender and inflection:

• donasjonsavtale follows avtale
• matbransje follows bransje

So even though the compounds are longer, they behave grammatically like their final noun element.

A rough pronunciation guide for an English speaker could be:

do-nah-SJOHNS-av-tah-len YEL-der ee MAHT-bran-shen

A few useful notes:

• sj in donasjons- sounds like sh
• gj in gjelder is tricky for English speakers; in careful speech it is a soft sound, and many learners approximate it with y
• bransjen has the same sh sound in the middle

You do not need perfect pronunciation right away, but recognizing the sh-like sound in -sjon and sj is very helpful.