。
The bottle shattered into pieces.
Literal
Bottle [topic-は] to-smithereens broke.
粉々に ('to smithereens') is the adverbial form of 粉々, a reduplicated form from 粉 ('powder'). 割れる is the intransitive partner of 割る — the bottle broke on its own, no agent specified. A clean example of transitive/intransitive pairs.