Subject + 把 + Object + 分成 + Number/Modifier + Parts
The verb 分成 (fēnchéng) means to divide into or split into separate parts. It is used when something is being separated into distinct groups, portions, or categories. The 成 indicates the resulting state after division.
老师把学生分成了四个小组。
Lǎoshī bǎ xuéshēng fēnchéngle sì gè xiǎozǔ.
The teacher divided the students into four groups.
我们可以把这块蛋糕分成八份。
Wǒmen kěyǐ bǎ zhè kuài dàngāo fēnchéng bā fèn.
We can divide this cake into eight pieces.
这本书分成三个部分,每个部分讲一个主题。
Zhè běn shū fēnchéng sān gè bùfèn, měi gè bùfèn jiǎng yī gè zhǔtí.
This book is divided into three parts, each covering a different topic.