Ten spyte daarvan dat erfgename kla, parafeer testateurs kodisille.

Yes. Ten spyte daarvan dat is a fixed expression meaning despite the fact that or in spite of the fact that.

You can think of it in parts:

• ten spyte van = despite / in spite of
• daarvan = of that
• dat = that

Together, ten spyte daarvan dat ... introduces a full clause:

• Ten spyte daarvan dat erfgename kla, ... = Despite the fact that heirs complain, ...

This is more formal than simply using a shorter conjunction like alhoewel.

In standard Afrikaans, ten spyte daarvan dat is the normal pattern when a whole clause follows.

• ten spyte van is normally followed by a noun or noun phrase:
  • ten spyte van die klagtes = despite the complaints
• If you want to follow it with a full clause, Afrikaans commonly uses:
  • ten spyte daarvan dat ...

So daarvan acts like a link between the prepositional expression and the following dat-clause.

Ten spyte dat would usually sound non-standard or at least much less idiomatic.

This is because Afrikaans follows the verb-second rule in main clauses.

When something comes first in the sentence other than the subject—here, the fronted clause Ten spyte daarvan dat erfgename kla—the finite verb must come next.

So the structure is:

• Fronted element: Ten spyte daarvan dat erfgename kla
• Finite verb: parafeer
• Subject: testateurs
• Object: kodisille

That gives:

• Ten spyte daarvan dat erfgename kla, parafeer testateurs kodisille.

If the sentence started with the subject, then you would get the more basic order:

• Testateurs parafeer kodisille ...

Because dat introduces a subordinate clause, and Afrikaans subordinate clauses have different word order from main clauses.

With a simple clause like this one, the verb comes after the subject:

• dat erfgename kla

That is normal subordinate-clause order.

This becomes easier to see when there is more material in the clause:

• dat erfgename gereeld kla
• dat erfgename oor die testament kla

In those examples, the verb kla comes toward the end of the subordinate clause, which is typical in Afrikaans.

Because Afrikaans verbs usually do not change according to person or number the way English verbs sometimes do.

Compare:

• ek parafeer
• jy parafeer
• hy parafeer
• ons parafeer
• testateurs parafeer

The verb form stays the same.

This is one of the simpler parts of Afrikaans grammar: there is very little verb conjugation in the present tense.

Parafeer means to initial, or sometimes to mark/sign with initials, especially in formal or legal contexts.

It is not quite the same as a full signature in every context. A person may parafeer pages, amendments, or specific legal documents to show approval or acknowledgment.

So in a legal sentence like this, parafeer sounds very technical and appropriate.

Not really. These are quite formal, especially testateurs and kodisille.

• erfgename = heirs
  This is understandable outside legal language, but still somewhat formal.
• testateurs = testators
  Very legal and not common in everyday conversation.
• kodisille = codicils
  Also highly legal and uncommon in normal speech.

So the whole sentence sounds formal, technical, and legal rather than conversational.

The singular forms are:

• erfgenaam → erfgename
• testateur → testateurs
• kodisil → kodisille

This sentence uses all three in the plural.

These plurals are useful to learn because not all Afrikaans nouns form the plural in the same way:

• erfgenaam adds -e
• testateur adds -s
• kodisil becomes kodisille

That last one is especially worth memorizing as a lexical item.

Afrikaans does not always use articles where English might expect them.

In this sentence, the nouns are being used in a fairly general or institutional way:

• erfgename = heirs, in general
• testateurs = testators
• kodisille = codicils

Adding die would make them sound more specific:

• die erfgename = the heirs
• die testateurs = the testators
• die kodisille = the codicils

Without die, the sentence has a more general, abstract, legal-register feel.

Yes. The sentence as given is very formal and legalistic.

A more natural alternative might use more common vocabulary or a simpler linker, depending on the exact context. For example:

• Al kla erfgename, parafeer testateurs kodisille.
• Hoewel erfgename kla, parafeer testateurs kodisille.

You could also replace some of the very technical nouns in less legal contexts, but that would depend on how precise you need to be.

So the original is grammatical, but it sounds like something from a legal text, not casual speech.

Because the sentence begins with a subordinate clause or clause-like introductory element:

• Ten spyte daarvan dat erfgename kla, ...

After that introductory clause, Afrikaans normally places a comma before the main clause:

• ..., parafeer testateurs kodisille.

This is very similar to English punctuation in sentences like:

• Although the heirs complain, the testators initial codicils.

So the comma helps mark the boundary between the introductory clause and the main clause.