My oom sê dat alles makliker voel wanneer die huis vol mense is en almal lag.

Oom literally means uncle.

In everyday South African Afrikaans, oom can also be used more loosely for an older man, a bit like a respectful uncle even if he is not a family member. In this sentence, though, the most natural reading is simply my uncle.

Afrikaans verbs usually do not change form for different subjects in the present tense.

So you get:

• ek sê = I say
• jy sê = you say
• hy sê = he says
• ons sê = we say

Unlike English, there is no special -s ending for he/she/it in the present tense.

The ê helps show pronunciation and also distinguishes sê from other words spelled differently in plain text, especially se.

• sê = say
• se = a possessive marker in colloquial Afrikaans, as in Jan se boek

So the accent is useful both for pronunciation and for avoiding confusion.

Dat means that and introduces a subordinate clause.

So:

• My oom sê = my uncle says
• dat alles makliker voel ... = that everything feels easier ...

This is very common after verbs of saying, knowing, thinking, and so on.

After words like dat, Afrikaans usually uses subordinate clause word order, which often pushes the verb later in the clause than English does.

Compare:

• Main clause: Alles voel makliker
• After dat: dat alles makliker voel

In English, everything feels easier keeps the verb earlier. In Afrikaans, the verb often comes later in subordinate clauses.

Yes. Makliker is the comparative form of maklik, so it means easier.

• maklik = easy
• makliker = easier

Afrikaans often forms comparatives by adding -er, just like English sometimes does:

• groot → groter
• sterk → sterker
• maklik → makliker

So alles makliker voel means everything feels easier.

Yes, voel works very much like English feel here.

It can describe physical feeling, but also a general emotional or atmospheric sense:

• Ek voel moeg = I feel tired
• Dit voel reg = It feels right
• Alles voel makliker = Everything feels easier

So this is a very natural Afrikaans use of voel.

Wanneer introduces a time clause. Depending on context, it can mean when or whenever.

In this sentence, it has the sense of when / whenever the house is full of people and everyone is laughing.

Afrikaans also sometimes uses as for time clauses, but wanneer is clearly temporal and avoids confusion with if.

That is another result of subordinate clause word order.

Compare:

• Main clause: Die huis is vol mense
• Subordinate clause: wanneer die huis vol mense is

So after wanneer, the verb is moves to the end of that clause.

In Afrikaans, vol often goes directly with a noun phrase, without needing a separate word like English of.

So:

• vol mense = full of people
• vol water = full of water
• vol idees = full of ideas

That is just the normal Afrikaans pattern.

Because mense here is an indefinite plural noun.

Afrikaans does not use an indefinite article in the plural. So:

• 'n mens = a person
• mense = people

That means vol mense is perfectly normal for full of people. You do not need anything equivalent to some or a there.

This is an important distinction:

• alles = everything
• almal = everyone / everybody

So in this sentence:

• alles makliker voel = everything feels easier
• almal lag = everyone is laughing

English speakers often mix these up at first, so it is a very useful pair to remember.

Because Afrikaans often uses the simple present where English might use either the simple present or the present continuous.

So:

• almal lag can mean everyone laughs or everyone is laughing
• hy eet can mean he eats or he is eating

The exact meaning usually comes from context. In this sentence, everyone is laughing is the natural English translation.

Yes:

• My oom = my uncle
• sê = says
• dat = that
• alles makliker voel = everything feels easier
• wanneer = when / whenever
• die huis vol mense is = the house is full of people
• en almal lag = and everyone is laughing

So the sentence is built as:

main clause + dat-clause + wanneer-clause

That is a very common Afrikaans sentence pattern.