Sejauh mana pun setiausaha menjelaskan, wakil itu masih tidak setuju.

It means no matter how far / to whatever extent / however much.

In this sentence, sejauh mana pun introduces a concessive idea: something remains true despite whatever happened before it.

• sejauh mana = how far / to what extent
• pun = adds the sense of no matter ...

So here, sejauh mana pun setiausaha menjelaskan means something like:

• no matter how much the secretary explained
• however thoroughly the secretary explained
• to whatever extent the secretary explained

It does not literally mean physical distance here.

No. In this sentence, pun does not mean also or too.

Malay pun has several uses. Two very common ones are:

• also/too/even
• a marker in expressions like no matter ..., even if ..., however ...

Here it is the second kind.

So:

• Saya pun mahu pergi. = I want to go too.
• Sejauh mana pun... = No matter how far / to whatever extent...

That is why you should read pun here as part of a concessive structure, not as too.

Because in standard Malay spelling, pun is usually written as a separate word when it functions like this.

So:

• sejauh mana pun
• apa pun
• siapa pun
• bila pun

There are some fixed forms where pun is written together, such as:

• walaupun
• meskipun
• adapun

But in your sentence, sejauh mana pun is correctly written as three separate words.

Because menjelaskan means to explain (something), which is the verb needed here.

Breakdown:

• jelas = clear / to be clear
• menjelaskan = to explain / to make something clear

So:

• Perkara itu jelas. = That matter is clear.
• Dia menjelaskan perkara itu. = He/She explained that matter.

In your sentence, the secretary is doing the act of explaining, so menjelaskan is the natural choice.

The object is omitted because it is understood from context.

Malay often leaves out objects when they are already known or not important. So although menjelaskan is usually transitive, the sentence can still sound complete without saying exactly what was explained.

An expanded version could be:

• Sejauh mana pun setiausaha menjelaskan perkara itu, wakil itu masih tidak setuju.

Here, perkara itu = that matter / the issue.

So yes, there is an understood object, but Malay does not always need to state it.

Wakil itu means that representative or, depending on context, the representative.

In Malay, demonstratives like ini and itu usually come after the noun:

• wakil itu = that/the representative
• rumah ini = this house
• buku itu = that book

This is different from English, where this and that come before the noun.

So the word order is normal Malay word order.

Masih means still, so masih tidak setuju means still did not agree or was still not in agreement.

It shows that the lack of agreement continued even after the explanation.

• masih = still
• tidak setuju = not agree / not in agreement

So the sentence emphasizes persistence:

• the secretary explained
• but the representative still did not agree

A close alternative would be tetap tidak setuju, which can sound a little more like remained firm in not agreeing.
But masih tidak setuju is perfectly natural and straightforward.

Setuju behaves like a stative predicate in Malay, so English speakers may feel it is somewhere between an adjective and a verb.

In practice:

• Dia setuju. = He/She agrees / is in agreement.
• Dia tidak setuju. = He/She does not agree.

So tidak setuju is very common and natural.

Yes, bersetuju is also possible:

• wakil itu masih tidak bersetuju

Compared with setuju, bersetuju can sound a bit more formal or explicit, but both are correct in many contexts.

The sentence has two parts:

1. Sejauh mana pun setiausaha menjelaskan
   = a concessive subordinate clause
2. wakil itu masih tidak setuju
   = the main clause

So the overall pattern is:

• No matter how much X did Y, Z still...

More literally:

• Sejauh mana pun = no matter to what extent
• setiausaha = the secretary
• menjelaskan = explained
• wakil itu = the representative
• masih tidak setuju = still did not agree

This is a very typical Malay way to express even though / no matter how much.

Yes, sejauh mana can be used in a question:

• Sejauh mana dia faham? = To what extent does he understand?

But when you add pun, it stops being a question and becomes a concessive expression:

• sejauh mana pun = to whatever extent / no matter how much

So in your sentence, it is not asking how much did the secretary explain?
Instead, it is saying regardless of how much the secretary explained...

Yes, the comma is helpful and natural.

It separates the fronted subordinate clause from the main clause:

• Sejauh mana pun setiausaha menjelaskan, wakil itu masih tidak setuju.

Without the comma, the sentence is still understandable, but the comma makes the structure much clearer in writing.

It is similar to English punctuation in sentences like:

• No matter how much the secretary explained, the representative still did not agree.

Yes. A few natural alternatives are:

• Walau sejauh mana pun setiausaha menjelaskan, wakil itu masih tidak setuju.
• Biarpun setiausaha menjelaskan berkali-kali, wakil itu masih tidak setuju.
• Sebanyak mana pun setiausaha menjelaskan, wakil itu masih tidak setuju.

These all keep the same general meaning, but the nuance changes slightly:

• walau / biarpun = although / even though
• berkali-kali = repeatedly
• sebanyak mana pun = no matter how much

Your original sentence is grammatical and natural, but learners may hear several similar patterns in real usage.