De opvangdag heeft twee dagdelen.

Opvangdag is a compound noun:

• opvang = childcare / care / daycare / care provision
• dag = day

Dutch very often joins nouns together into a single word, where English might use two words or a phrase. So opvangdag means something like childcare day, daycare day, or day of care, depending on context.

In compounds, the last part is the main noun, so opvangdag is a kind of dag.

Because dag is a de-word, and in Dutch compounds, the grammatical gender usually comes from the last element of the compound.

So:

• de dag
• therefore de opvangdag

Even though opvang by itself is de opvang, the important rule here is that the final part, dag, determines the article.

Because the subject is singular: de opvangdag.

The verb hebben is conjugated here in the present tense:

• ik heb
• jij hebt
• hij/zij/het heeft
• wij/jullie/zij hebben

Since de opvangdag is grammatically singular, Dutch uses heeft.

Dagdelen is the plural of dagdeel.

A dagdeel is literally a part of a day. In practical contexts, it often means something like a morning session or afternoon session.

So twee dagdelen means two parts of the day. In a childcare or school context, it may refer to two sessions in one day.

In Dutch, after a number, the noun normally appears in the plural form with no extra word like of or parts added.

So:

• één dagdeel = one part of the day
• twee dagdelen = two parts of the day

The plural of dagdeel is dagdelen. That is the regular plural form here.

Because Dutch normally does not use an article before a noun when it is directly preceded by a number.

So you say:

• twee dagdelen
  not
• de twee dagdelen unless you specifically mean the two day-parts in a definite, already-known sense.

In this sentence, twee dagdelen is just stating how many there are, so no article is needed.

No, this is normal main-clause Dutch word order:

De opvangdag + heeft + twee dagdelen
subject + verb + object

This is the standard pattern for a simple statement in Dutch.

Yes. Dutch often uses hebben in a broad sense, including to have, to contain, or to consist of in everyday language.

So De opvangdag heeft twee dagdelen naturally means that the childcare day has, includes, or consists of two parts.

English might sometimes prefer consists of in formal wording, but Dutch heeft is completely normal here.

A very literal rendering would be:

The childcare day has two parts of the day.

That sounds a bit clumsy in English, but it helps show the Dutch structure. A more natural English version might be:

• The childcare day consists of two sessions.
• The daycare day has two sessions.
• The day is divided into two parts.

The exact best translation depends on context.

Roughly: DAKH-day-lun

A few notes:

• dag ends with a hard guttural Dutch g/ch sound.
• deel sounds somewhat like English dale, but with a pure Dutch vowel.
• The plural ending -en is often pronounced like a weak -uh(n) sound.

The main stress is on the first syllable: DAGdelen.