One action is completed before the next one takes place:
Hái zǐ chī le fàn huí jiā qù le 。
After eating, the child went home.
(The actions 吃饭 chī fàn ‘eat’ and 回家 huí jiā ‘go home’ happen one after the other.)
Tā bǎ xìn fēng hǎo，tiē shàng yóu piào，tóu jìn yóu tǒng 。
He sealed the envelope, stuck a stamp on (it) and dropped (it) into the letter box.
 Yip, P. C., Rimmington, D., Xiaoming, Z., & Henson, R. (2009). Basic Chinese: a grammar and workbook. Taylor & Francis.