Bros itu hadiah dari nenek, dan kakak perempuan saya hanya memakainya pada acara penting.

In Indonesian, itu often comes after a noun to mean that or the in context.

• bros itu = that brooch / the brooch
• rumah itu = that house
• buku itu = that book

So Bros itu is a normal Indonesian noun phrase. English puts that before the noun, but Indonesian usually puts itu after it.

Dari usually means from. In this sentence, hadiah dari nenek means a gift from grandmother.

So:

• hadiah = gift
• dari nenek = from grandmother

Together: hadiah dari nenek = a gift from grandmother

Depending on context, this can mean:

• grandmother gave the gift, or
• the gift came from grandmother

In this sentence, it clearly means the brooch was given by the grandmother.

Indonesian often leaves out possessive words when the relationship is obvious from context.

So nenek can mean:

• grandmother
• my grandmother
• the grandmother

Here, because the sentence also says kakak perempuan saya (my older sister), it is natural to understand nenek as our/my grandmother without saying nenek saya.

If you wanted to be more explicit, you could say:

• Bros itu hadiah dari nenek saya = That brooch is a gift from my grandmother.

Both are possible.

Indonesian often distinguishes siblings by age.

• kakak = older sibling
• adik = younger sibling

Because kakak by itself does not specify male or female, you can add:

• kakak perempuan = older sister
• kakak laki-laki = older brother

So kakak perempuan saya means my older sister.

By contrast:

• saudara perempuan saya means my sister / female sibling, but it sounds more formal and less natural in everyday family talk.

In Indonesian, possessors usually come after the noun.

So:

• kakak perempuan saya = my older sister
• rumah saya = my house
• ibu saya = my mother

This is different from English, where my comes before the noun.

Hanya means only.

In kakak perempuan saya hanya memakainya pada acara penting, it tells us that the older sister wears it only on important occasions.

Compare:

• Kakak perempuan saya memakainya pada acara penting
  = My older sister wears it on important occasions.

• Kakak perempuan saya hanya memakainya pada acara penting
  = My older sister only wears it on important occasions.

So hanya limits when she wears it.

Memakainya can be broken into parts:

• pakai = wear, use
• meN- → memakai = to wear / to use
• -nya = it

So:

• memakai = wear
• memakainya = wear it

This is very common in Indonesian, where object pronouns can attach to the verb:

• melihatnya = see it / see him / see her
• membacanya = read it
• memakainya = wear it

Here -nya refers back to bros itu.

The base word is pakai. When the meN- prefix is added, its form changes depending on the first sound of the root.

With words beginning in p, the p often drops, and meN- becomes mem-:

• pakai → memakai
• pilih → memilih

This is a normal sound change in Indonesian word formation.

In this sentence, memakai is the active verb meaning to wear.

In this sentence, -nya means it.

So memakainya = wear it.

The ending -nya can have several uses in Indonesian, including:

• his/her/their
• it
• sometimes a definite or emphatic sense

But here it is clearly the object pronoun referring to bros itu.

So do not translate it as wears her or wears his here. It simply means wears it.

Both pada and di can sometimes be translated as at, but pada is often used with times, occasions, events, or more formal contexts.

So:

• pada acara penting = at important events / on important occasions

This sounds natural and slightly formal.

You may also hear di acara penting in everyday speech, and it can be understandable, but pada is especially suitable when talking about occasions or circumstances rather than a simple physical location.

It can mean either, depending on context.

• acara = event, occasion, program, ceremony
• penting = important

So pada acara penting could be understood as:

• at important events
• on important occasions
• for special occasions

In natural English, on special occasions is often the smoothest translation, even though penting literally means important, not exactly special.

Indonesian nouns do not have to change form for singular or plural.

So acara penting can mean:

• an important event
• important events
• important occasions

The context tells you whether it is singular or plural. Because of hanya memakainya pada acara penting, English naturally interprets it as a general habit: she wears it only at important occasions.

If Indonesian wants to make plurality very clear, it can use reduplication:

• acara-acara penting = important events

But that is not necessary here.

The basic structure is:

• kakak perempuan saya = subject
• hanya = only
• memakainya = verb + object
• pada acara penting = prepositional phrase

So the order is: Subject + hanya + Verb + Object + Time/occasion phrase

This is a very natural order in Indonesian.

You could sometimes move parts around for emphasis, but the given sentence is straightforward and standard.

Bros is a borrowed word, ultimately from a European source, and in Indonesian it means brooch.

It is a normal modern Indonesian word, even though it is not originally native. Indonesian uses many borrowed words, and learners will see this often.

So here:

• bros = brooch
• Bros itu = that brooch

Yes, but changing its position can slightly affect emphasis.

The sentence has:

• kakak perempuan saya hanya memakainya pada acara penting

This most naturally means:

• she only wears it on important occasions

You might also see similar sentences like:

• Kakak perempuan saya memakainya hanya pada acara penting
  This emphasizes only on important occasions a bit more directly.

Both are understandable. The original sentence is perfectly natural.

The connector dan simply means and.

So:

• Bros itu hadiah dari nenek = That brooch is a gift from grandmother.
• dan = and
• kakak perempuan saya hanya memakainya pada acara penting = my older sister only wears it on important occasions.

Indonesian often links clauses with dan just as English does. There is no need for an extra word meaning then unless the speaker wants to show sequence more clearly.