Kilden forklarer årsaken og sammenhengen.

and

Breakdown of Kilden forklarer årsaken og sammenhengen.

• forklare: to explain
• årsaken: the cause
• kilden: the source

Questions & Answers about Kilden forklarer årsaken og sammenhengen.

Why do kilden, årsaken, and sammenhengen all end in -en?

Because they are definite singular nouns. In Norwegian, the equivalent of the is often attached to the end of the noun instead of being a separate word.

• kilde = source

• kilden = the source

• årsak = cause / reason

• årsaken = the cause / reason

• sammenheng = connection / context / relationship
• sammenhengen = the connection / context / relationship

This is very common in Norwegian. English uses a separate article (the), but Norwegian often uses a suffix.

Why is there no separate word for the in this sentence?

Because Norwegian usually marks definiteness by adding it to the noun itself.

So instead of:

• the source
• the cause
• the connection

Norwegian says:

• kilden
• årsaken
• sammenhengen

A separate determiner like den can appear too, but usually only in certain structures, especially with adjectives:

• kilden = the source
• den viktige kilden = the important source

So in your sentence, no extra word is needed.