Na tien minuten in de oven wordt het brood nog knapperiger.

Because the sentence starts with a different element: Na tien minuten in de oven. In Dutch main clauses, the finite verb normally comes in the second position.

So the structure is:

• Na tien minuten in de oven = first element
• wordt = finite verb in second position
• het brood = subject

This is called inversion.

Compare:

• Het brood wordt nog knapperiger.
• Na tien minuten in de oven wordt het brood nog knapperiger.

Both are correct; the second one just begins with the time phrase.

Na means after.

So:

• na tien minuten = after ten minutes

It introduces a point in time that comes later than something else. In this sentence, it means that once the bread has been in the oven for ten minutes, it becomes even crispier.

Dutch usually does not use an article in this kind of time expression.

So you say:

• na tien minuten = after ten minutes
• na een uur = after an hour
• na drie dagen = after three days

This works much like English, where you also say after ten minutes, not after the ten minutes.

Because Na tien minuten in de oven is one natural chunk meaning something like after ten minutes in the oven.

The phrase in de oven tells you where those ten minutes are spent. It belongs closely with the time expression.

So the sentence opens with a combined time-place phrase:

• Na tien minuten in de oven = after ten minutes in the oven

Dutch often groups this kind of information together at the beginning of a sentence.

Here wordt comes from worden, which means to become or to get.

So:

• het brood wordt knapperiger = the bread becomes crispier / the bread gets crispier

It does not mean simple is here. If you said:

• het brood is knapperiger

that would mean the bread is crispier, describing a state or comparison, not the process of becoming crispier.

No. Even though worden is also used to form the passive, this sentence is not passive.

Why not? Because wordt is followed by an adjective:

• knapperiger

In a passive sentence, worden is usually followed by a past participle:

• Het brood wordt gebakken. = The bread is being baked.

But here:

• Het brood wordt nog knapperiger.

means The bread becomes even crispier, so wordt is a normal main verb meaning becomes.

Here nog means even.

So:

• nog knapperiger = even crispier

It strengthens the comparative. It suggests the bread was already crispy, and after ten minutes it becomes more crispy than before.

Compare:

• knapperiger = crispier
• nog knapperiger = even crispier

Knapperiger is the comparative form of knapperig.

• knapperig = crispy / crunchy
• knapperiger = crispier

In Dutch, many comparatives are formed with -er. Because knapperig already ends in -ig, the comparative becomes:

• knapperig → knapperiger

This is similar to English crispy → crispier, though the exact spelling rules are different.

Because brood is a het-word in Dutch.

So the correct article is:

• het brood = the bread

This is something you usually have to learn with the noun itself, since Dutch nouns take either de or het.

Yes, that is also grammatical.

The difference is mainly one of emphasis and information structure:

• Na tien minuten in de oven wordt het brood nog knapperiger.
  This emphasizes the time condition first.
• Het brood wordt na tien minuten in de oven nog knapperiger.
  This starts with the subject, which is more neutral in some contexts.

Dutch allows this flexibility, but when a phrase is moved to the front, the verb still has to stay in second position.

A helpful breakdown is:

• Na tien minuten in de oven = time/place phrase
• wordt = finite verb
• het brood = subject
• nog knapperiger = complement

So the pattern is:

• [fronted phrase] + [finite verb] + [subject] + [rest]

That is a very common Dutch main-clause pattern.