Mense means people. Its singular form is mens, meaning person or human being.
So:
This is an irregular plural, so it is not formed by simply adding -e or -s in a predictable way from English.
Afrikaans does not use a separate present-tense verb like English am / is / are before another main verb in sentences like this.
The verb kom by itself carries the meaning come / is coming / are coming, depending on context.
So:
Afrikaans often uses the simple present where English prefers the present continuous.
No. In Afrikaans, verbs usually do not change form for different persons or for singular/plural the way they do in English.
So you get:
So mense kom is completely normal.
Because Sowat tien mense is the subject of the sentence, and this is a normal main-clause word order in Afrikaans.
Afrikaans is a verb-second language in main clauses. That means the finite verb normally comes in the second position.
Here the first element is the whole subject phrase:
So the sentence follows normal Afrikaans word order.
Yes, in principle it could. The Afrikaans present tense can be used for:
So Sowat tien mense kom could mean:
In most real situations, context makes it clear which meaning is intended.
Yes. Daar kom sowat tien mense is also natural, and it means something like:
Adding daar can make the sentence sound a bit more like an existential statement, similar to English there are / there come. But Sowat tien mense kom is already perfectly correct on its own.