Pemasang pin menyusun pin boling ketika bola di rak bola.

Pemasang pin means pinsetter.

It comes from:

• pasang = to set up, install, put in place
• peN- / pem- = a prefix that can mean the doer or the thing that does something

So pemasang pin can refer to:

• a person who sets up the pins, or
• a machine that resets the pins

In bowling context, it often suggests the pinsetter machine, unless the context clearly means a worker.

Because menyusun is the normal active verb form here.

The root is:

• susun = arrange, stack, put in order

With the active prefix meN-, it becomes:

• meN- + susun → menyusun

This is a common sound change in Malay:

• when the root begins with s, the s often drops and meN- becomes meny-

So:

• susun = the base idea
• menyusun = to arrange / is arranging

In a full sentence with a subject doing the action, menyusun sounds natural:

• Pemasang pin menyusun pin boling.

The bare form susun is more likely in:

• commands: Susun pin itu.
• casual shortened speech

Because Malay usually puts the main noun first and the describing word after it.

So:

• pin boling = bowling pin
• rak bola = ball rack

This is a very common Malay pattern:

• bola tenis = tennis ball
• rak buku = bookshelf / book rack
• mesin basuh = washing machine

So in Malay, the structure is often the reverse of English.

Malay often adapts English loanwords to Malay spelling.

So:

• English bowling
• Malay boling

The spelling is changed to better match Malay pronunciation and spelling habits.

Meanwhile, pin stays pin because it already fits Malay spelling pretty easily.

So pin boling is the normal Malay-style form.

Malay usually does not use articles like English a, an, and the.

So a noun like bola can mean:

• a ball
• the ball

The exact meaning depends on context.

If Malay wants to be more specific, it can add words such as:

• sebiji bola = a ball / one ball
• bola itu = that ball / the ball

But in many sentences, Malay leaves this unstated because the context is enough.

Because Malay often leaves out the verb to be in this kind of sentence.

So:

• bola di rak bola literally looks like ball at/on ball rack
• but it means the ball is on the ball rack

This is normal in Malay.

Malay often omits is/are in:

• location
• description
• identification, depending on the structure

If you want to make it more explicit, you can say:

• bola berada di rak bola

That means:

• the ball is located on the ball rack

In fact, using adalah here would usually sound unnatural.

Ketika can mean when, while, or at the time that, depending on context.

In this sentence, it most naturally means:

• when or
• while

So the idea is that the pinsetter arranges the pins at the time the ball is on the rack.

A few similar words are:

• semasa = during / while
• apabila = when
• bila = when, more informal

Ketika sounds a bit more neutral or slightly formal than bila.

Because here di is a preposition, meaning something like:

• in
• on
• at

Prepositional di is written separately:

• di rak
• di rumah
• di sekolah

This is different from the passive prefix di-, which is written attached:

• disusun = arranged
• dipasang = set up

So this is an important spelling rule in Malay:

• di rak = on the rack
• disusun = is arranged

Malay di is more general than English.

It can cover several English location meanings:

• in
• on
• at

So di rak bola just marks the ball’s location relative to the rack.

In English, the best translation depends on the real-world situation:

• on the ball rack
• in the ball rack
• sometimes even at the ball rack

In a bowling setting, English often prefers on the ball rack or in the ball return, but Malay simply uses di.

Malay nouns often do not change form for plural.

So:

• pin boling can mean a bowling pin
• or bowling pins

The context tells you which one is meant.

Here, because a pinsetter normally deals with several pins, pin boling is naturally understood as plural.

If you really want to show plural clearly, Malay can use:

• pin-pin boling
• beberapa pin boling

But in many natural sentences, that is unnecessary.

Because the two instances of bola are doing different jobs:

• the first bola = the actual ball in the sentence
• rak bola = a compound noun meaning ball rack

So the repetition is grammatical:

• bola ... rak bola

This kind of repetition can happen in Malay:

• buku di rak buku = book on the bookshelf

It may sound repetitive to an English speaker, but the structure itself is normal.

That said, if the context is already clear, a speaker might shorten it:

• ketika bola di rak itu
• ketika bola berada di atas rak

It is understandable, but it sounds a little textbook-like or slightly stiff.

A more natural version might be:

• Pemasang pin menyusun pin boling ketika bola berada di rak bola.

Adding berada makes the second part feel more complete and natural.

If you want to make it especially clear that the subject is a machine, you could also say:

• Mesin pemasang pin menyusun pin boling ketika bola berada di rak bola.

So the original sentence is not wrong, but a native speaker might choose a smoother version depending on context.