Ons begrip van die reëls is duidelik.

In Afrikaans, ons can mean both we and our, depending on how it is used.

• Ons verstaan die reëls. = We understand the rules.
• Ons begrip van die reëls... = Our understanding of the rules...

Here, ons comes directly before a noun, begrip, so it functions as a possessive word: our understanding.

Begrip means understanding, grasp, or comprehension.

In this sentence, it refers to a mental understanding of something:

• Ons begrip van die reëls = our understanding of the rules

It is a noun, not a verb.
Compare:

• Ons begrip = our understanding
• Ons verstaan = we understand

So begrip is the thing itself, while verstaan is the action.

Van usually means of or from, but here it means of.

So:

• begrip van die reëls = understanding of the rules

This is a very common structure in Afrikaans, just like in English:

• die naam van die stad = the name of the city
• die kleur van die motor = the color of the car

So van links begrip to what is being understood: the rules.

Yes. In Afrikaans, die is the definite article for both singular and plural nouns.

• die reël = the rule
• die reëls = the rules

Unlike English, Afrikaans does not change the article for number, and unlike some other languages, it does not have grammatical gender articles like der, die, das in German.

Reëls is the plural of reël.

• singular: reël = rule
• plural: reëls = rules

The two dots on ë are a diaeresis. They show that the vowels are pronounced in separate syllables rather than blended together.

So reëls is pronounced roughly as REE-uhls or REE-els, not as one smooth vowel sound.

This spelling helps the reader hear the word correctly.

This is normal Afrikaans word order for a basic statement:

subject + verb + complement

So:

• Ons begrip van die reëls = subject
• is = verb
• duidelik = complement/adjective

That gives:

• Ons begrip van die reëls is duidelik.

This works very much like English:
Our understanding of the rules is clear.

Duidelik means clear.

In this sentence, it comes after is, so it is a predicate adjective:

• ... is duidelik = ... is clear

In this position, it does not change form.

But when an adjective comes before a noun, it often takes -e:

• die duidelike reëls = the clear rules

So compare:

• Die reëls is duidelik. = The rules are clear.
• die duidelike reëls = the clear rules

This is a very useful pattern in Afrikaans.

Because the sentence says our understanding, not the understanding.

The word ons already makes the noun definite in meaning. In English, we also do not say the our understanding.

So:

• ons begrip = our understanding
• not die ons begrip

Possessive words like my, jou, ons, hulle normally replace the article.

No. One thing English speakers often notice is that Afrikaans is quite simple here.

In this sentence:

• there is no grammatical gender
• there are no case endings
• the article does not change form

So you do not need to worry about masculine/feminine/neuter or nominative/accusative/genitive forms here.

That is why the sentence stays fairly straightforward: Ons begrip van die reëls is duidelik.

Yes, but it means something slightly different.

• Ons verstaan die reëls. = We understand the rules.
• Ons begrip van die reëls is duidelik. = Our understanding of the rules is clear.

The first sentence states the fact of understanding.
The second talks about the quality or clarity of that understanding.

So they are related, but not identical.

A rough pronunciation guide is:

Ons begrip van die reëls is duidelik
≈ ons buh-GRIP fahn dee REE-uhls is DUY-duh-lik

A few notes:

• ons sounds roughly like ons in English, but shorter and cleaner
• begrip has stress on the second syllable: be-GRIP
• van is usually a light, unstressed word
• die is often pronounced like dee
• reëls has separate vowel sounds because of the diaeresis
• duidelik usually has stress near the beginning: DUY-de-lik

Pronunciation varies somewhat by speaker and region, but this will guide you well.

Yes, depending on context, duidelik can function as clear or clearly.

Examples:

• Dit is duidelik. = It is clear.
• Hy praat duidelik. = He speaks clearly.

In your sentence, it means clear, because it follows is and describes begrip.

A very literal breakdown is:

• Ons = our
• begrip = understanding
• van = of
• die = the
• reëls = rules
• is = is
• duidelik = clear

So the structure is:

Our understanding of the rules is clear.

That literal structure matches the natural English meaning quite closely.