Sambungan utiliti diatur; sementara itu, kami memasang semula meja.

Diatur is the passive form of atur (to arrange / to organize / to set up).

So:

• Kami mengatur sambungan utiliti = We arrange the utility connection(s)
• Sambungan utiliti diatur = The utility connection(s) are arranged / being arranged

Malay uses the passive very naturally, often more often than English does in similar situations. In this sentence, the focus is on the utility connections, not on who is doing the arranging.

Sambungan means connection or hook-up, and utiliti means utilities.

So sambungan utiliti usually refers to things like:

• electricity connection
• water connection
• gas connection
• internet/phone line connection

Depending on context, it could mean the utility connection, utility connections, or utility hookup in general.

Malay often leaves out the verb to be where English would require it.

So:

• Sambungan utiliti diatur literally looks like Utility connection arranged
• Natural English: The utility connections are arranged or The utility hookup is being arranged

This is very normal in Malay. The meaning comes from the structure and context, not from a separate word meaning is/are.

Sementara itu means meanwhile, in the meantime, or at the same time.

It is used to connect one action or situation with another happening during that period.

In your sentence:

• Sambungan utiliti diatur; sementara itu, kami memasang semula meja.
• The utility connections are being arranged; meanwhile, we are reassembling the table.

It is a very common linking phrase in both spoken and written Malay.

Malay has two different words for we:

• kami = we, but not including the listener
• kita = we, including the listener

So kami memasang semula meja means:

• We are reassembling the table
• The listener is not part of the group doing it

If the speaker wanted to include the listener, they would say kita instead.

Memasang means to install, to put together, to attach, or to assemble, depending on context.

Semula means again or anew.

So memasang semula means:

• to reassemble
• to put back together
• to reinstall

With meja (table), the most natural meaning is reassemble the table or put the table back together.

In Malay, semula is commonly written as a separate word after the verb:

• memasang semula = reassemble
• membina semula = rebuild
• menulis semula = rewrite

It works a bit like again or re- in English, but Malay often expresses this idea with a separate word rather than attaching a prefix.

Malay does not use articles like a, an, or the the way English does.

So meja can mean:

• a table
• the table
• sometimes just table in a general sense

The exact meaning depends on context. In this sentence, English would probably translate it as the table, because a specific table is likely meant.

By itself, meja is usually understood as singular unless the context suggests otherwise.

If Malay wants to make the plural very clear, it can use repetition:

• meja-meja = tables

But Malay often does not mark plural if the meaning is already obvious from context. In this sentence, meja most naturally means the table.

The semicolon separates two closely related clauses:

• Sambungan utiliti diatur
• sementara itu, kami memasang semula meja

It shows that the two parts are linked in meaning: one thing is happening, and during that time, another thing is happening.

A comma or a full stop could also appear in real writing, but the semicolon gives a slightly more formal written style.

All three can be possible, depending on context.

For sambungan utiliti, the most natural English choices are often:

• arranged
• set up
• being organized

For example:

• The utility connections are arranged
• The utility hookup is being set up

In practical English, being arranged or being set up often sounds the most natural here.

Yes, it is understandable and fairly natural, especially in written or semi-formal context.

A more conversational version might be something like:

• Sambungan utiliti sedang diatur. Sementara itu, kami pasang semula meja.

Differences:

• sedang diatur makes the ongoing action clearer: is being arranged
• pasang semula is a slightly more casual spoken style than memasang semula

But your original sentence is perfectly acceptable, especially in written narration or reporting.