Die omgewingsgesondheidspraktisyn gaan die higiënevereiste na.

Not in this sentence. Here gaan ... na is the split present-tense form of the separable verb nagaan, which means to check, inspect, review, or verify.

So this sentence is using one verb, nagaan, not the future helper gaan.

A useful comparison:

• Die omgewingsgesondheidspraktisyn gaan die higiënevereiste na. = The environmental health practitioner checks / is checking the hygiene requirement.
• Die omgewingsgesondheidspraktisyn gaan die higiënevereiste nagaan. = The environmental health practitioner is going to check the hygiene requirement.

Because nagaan is a separable verb.

In a main clause, Afrikaans often splits a separable verb:

• the finite part goes to the normal verb position near the front: gaan
• the separated part goes to the end: na

So:

• nagaan → gaan ... na

This is similar to what happens in Dutch and German.

A preposition na normally has a noun phrase after it:

• na die kantoor = to the office
• na ete = after the meal

In your sentence, na stands alone at the end and completes the meaning of gaan. That is a strong sign that it belongs to the separable verb nagaan.

So compare:

• Hy gaan na die kantoor. = He goes to the office.
• Hy gaan die dokument na. = He checks the document.

It can mean either, depending on context.

Afrikaans often uses the simple present where English might use either:

• checks
• is checking

So gaan ... na can mean:

• a general or regular action: checks
• an action happening now: is checking

If a speaker wants to emphasize that the action is in progress right now, they can use a more explicit form such as:

• is besig om die higiënevereiste na te gaan = is busy checking / is in the process of checking the hygiene requirement

Because die is the normal definite article in Afrikaans, meaning the.

It is used here once for the subject noun and once for the object noun:

• die omgewingsgesondheidspraktisyn
• die higiënevereiste

A helpful point for English speakers: Afrikaans does not change die for grammatical gender. It also stays die in the plural.

So Afrikaans is simpler than languages that have different forms for the.

Yes. Afrikaans, like Dutch and German, very often writes compound nouns as one word.

This word can be broken down like this:

• omgewing = environment
• gesondheid = health
• praktisyn = practitioner

Together, they form omgewingsgesondheidspraktisyn, literally something like environmental-health practitioner, or more naturally, environmental health practitioner.

Long compounds are very normal in Afrikaans.

That -s- is a linking sound/letter often used in Afrikaans compounds.

You can see it in:

• omgewing + gesondheid → omgewingsgesondheid
• gesondheid + praktisyn → gesondheidspraktisyn

It usually is not translated by a separate English word. It just helps connect the parts of the compound in a natural Afrikaans way.

English speakers often want to assign a direct meaning to that -s-, but usually it is better to think of it as a compound linker.

For the same reason: it is a compound noun.

It is made from:

• higiëne = hygiene
• vereiste = requirement

So higiënevereiste literally means hygiene requirement.

In English, we usually write noun + noun combinations as separate words, but Afrikaans very often joins them into one compound.

Usually not in the present tense.

Afrikaans verbs are much less inflected than English verbs. With gaan as part of nagaan, you get the same form for different subjects:

• ek gaan ... na
• jy gaan ... na
• hy/sy gaan ... na
• ons gaan ... na
• julle gaan ... na
• hulle gaan ... na

So you do not need to learn a big set of present-tense endings.

For the past tense, Afrikaans commonly uses het plus the past participle:

• Die omgewingsgesondheidspraktisyn het die higiënevereiste nagegaan.
  = The environmental health practitioner checked / has checked the hygiene requirement.

Notice that in the participle, the verb is written together again: nagegaan.

For a clear future meaning, you could say:

• Die omgewingsgesondheidspraktisyn sal die higiënevereiste nagaan.
  = The environmental health practitioner will check the hygiene requirement.

You may also hear:

• Die omgewingsgesondheidspraktisyn gaan die higiënevereiste nagaan.

In that version, the first gaan is the future helper, and nagaan stays together at the end.

With separable verbs, the infinitive stays split around te:

• om die higiënevereiste na te gaan

So te goes between the two parts:

• na + te + gaan

This is a very common pattern in Afrikaans separable verbs.

For example:

• Dit is belangrik om die higiënevereiste na te gaan.
  = It is important to check the hygiene requirement.

The dots on ë are a diaeresis. They show that the vowel should be pronounced as a separate syllable, rather than being merged with the vowel before it.

So higiëne is read in separate syllables, roughly:

• hi-gi-ë-ne

For a learner, the most important point is: the ë tells you do not blend these vowels into one sound.

This kind of spelling mark is fairly common in Afrikaans.