Sorteringen av kleshaugen er ferdig.

Sorteringen is a noun meaning the sorting.

It comes from the verb å sortere = to sort.
Norwegian often makes action nouns from verbs with -ing:

• å sortere → sortering = sorting
• sortering
  • -en → sorteringen = the sorting

So this is not a verb form. It is a noun referring to the activity or process.

Because Norwegian is treating it as a specific, known sorting process.

• sortering = sorting in a general sense
• sorteringen = the sorting, a particular sorting

In this sentence, we are not talking about sorting in general. We mean the specific task of sorting that clothes pile, so the definite form is natural.

Here av works like of in English.

So:

• sorteringen av kleshaugen = the sorting of the clothes pile

It connects the action noun sorteringen to what is being sorted.

This is very common in Norwegian when a verb has been turned into a noun:

• vaskingen av bilen = the washing of the car
• reparasjonen av sykkelen = the repair of the bike

Because Norwegian usually writes compound nouns as one word.

kleshaugen is built from:

• kles- = clothes-
• haug = pile
• -en = the

So:

• en kleshaug = a pile of clothes
• kleshaugen = the pile of clothes

Writing compounds as one word is very important in Norwegian.

This is a common compound pattern.

The basic noun is klær = clothes, but in compounds Norwegian often uses kles- as a combining form:

• klesskap = wardrobe / clothes closet
• klesvask = laundry
• kleshaug = pile of clothes

So kles- is just the normal form used in many compounds involving clothes.

Because Norwegian usually puts the at the end of the noun instead of using a separate word before it.

In this sentence:

• sorteringen = the sorting
• kleshaugen = the clothes pile

The ending -en marks definite singular for these nouns.

So English uses a separate word:

• the sorting
• the clothes pile

But Norwegian often uses a suffix instead:

• sorteringen
• kleshaugen

er ferdig means is finished, is done, or is complete.

So the sentence means that the sorting task has been completed.

A useful point: ferdig can sometimes mean ready, but in many contexts it means finished. Here, because it refers to a task, finished is the best understanding.

They can overlap a little, but they are not the same.

• ferdig = finished / done
• klar = ready

In this sentence, ferdig is correct because the idea is that the sorting has been completed.

Compare:

• Maten er ferdig. = The food is done.
• Jeg er klar. = I am ready.

Sometimes English uses ready where Norwegian prefers ferdig, but for completed tasks, ferdig is usually the better choice.

No, this is a very normal Norwegian sentence pattern:

• Sorteringen av kleshaugen = subject
• er = verb
• ferdig = predicate adjective

So it follows the basic pattern:

• Subject + verb + complement

Very literally:

• The sorting of the clothes pile is finished.

It is understandable and correct, but it is a little noun-heavy and can sound somewhat formal or written.

In everyday speech, Norwegians might also say:

• Jeg er ferdig med å sortere kleshaugen. = I’ve finished sorting the pile of clothes.
• Kleshaugen er ferdig sortert. = The pile of clothes has been fully sorted.

Your original sentence is still fine, especially if the focus is on the sorting process itself rather than on the person doing it.