Hun ælter dejen længe, fordi hun vil have blødt brød.

Ælter is the present tense of at ælte, meaning to knead.

So:

• at ælte = to knead
• hun ælter = she kneads / she is kneading

A very common Danish present-tense pattern is to add -r to the infinitive.

Because dejen means the dough, while dej means just dough.

Danish usually puts the definite article at the end of the noun:

• dej = dough
• dejen = the dough

So Hun ælter dejen means she is kneading a specific dough, not dough in general.

Længe is an adverb meaning for a long time.

It modifies the verb ælter, so Danish uses the adverb form:

• lang = long
• længe = for a long time / long (as an adverb of duration)

So:

• Hun ælter dejen længe = She kneads the dough for a long time.

You could also say i lang tid in some contexts, but længe is very natural here.

The comma marks the start of the because clause.

In Danish, you will often see a comma before a subordinate clause introduced by fordi. In modern usage, comma practice can vary depending on which comma system someone follows, so you may see both:

• Hun ælter dejen længe, fordi hun vil have blødt brød.
• Hun ælter dejen længe fordi hun vil have blødt brød.

Both can occur, but the version with the comma is very common.

Because fordi introduces a subordinate clause, and subordinate clauses do not use normal main-clause V2 word order.

In a main clause, Danish usually puts the finite verb in second position:

• Hun ælter dejen længe.

But after fordi, the subject comes before the finite verb:

• fordi hun vil have blødt brød

So the pattern is:

• fordi + subject + verb + ...

not

• fordi + verb + subject + ...

Here vil have means wants or wants to end up with.

Literally, it is wants to have, but in natural English the idea is:

• because she wants soft bread
• or because she wants the bread to be soft

So vil have is expressing the desired result.

Because brød is a neuter noun: et brød.

In Danish, an adjective before a singular indefinite neuter noun usually takes -t:

• blød = soft
• blødt brød = soft bread

Compare:

• en blød dej = a soft dough
• et blødt brød = a soft bread

So the -t shows agreement with the neuter noun brød.

Because the sentence is talking about soft bread in a general/result sense, not about one specific previously identified bread.

So:

• brød = bread / a bread
• brødet = the bread

In hun vil have blødt brød, the meaning is more like she wants soft bread as a result of what she is doing.

It is best understood as a general noun here, similar to how English can say soft bread without focusing on one countable loaf.

Danish brød can refer to bread in a broad sense, or sometimes to a loaf depending on context. In this sentence, the important thing is the quality blødt, not the exact number of loaves.

Yes. You can say:

Fordi hun vil have blødt brød, ælter hun dejen længe.

Notice what happens in the main clause after the fronted subordinate clause:

• ælter hun
• not hun ælter

That is normal Danish inversion in a main clause when something other than the subject comes first.

The two main tricky vowels are:

• æ in ælter
• ø in blødt and brød

Roughly:

• æ is somewhat like the vowel in English cat, though not exactly the same.
• ø has no exact English equivalent. It is similar to German ö or French eu.

So for many learners, brød and blødt are the hardest words in the sentence to pronounce naturally.

Yes, but it changes the structure and slightly shifts the emphasis.

• fordi hun vil have blødt brød = because she wants soft bread
• for at få blødt brød = in order to get soft bread

The original sentence focuses on her reason in terms of what she wants.
The for at få version focuses more on purpose or goal.

Both are natural, but they are not exactly the same construction.