分久必合，合久必分 fēn jiǔ bì hé, hé jiǔ bì fēn

fēn jiǔ bì hé, hé jiǔ bì fēn phrase that which is long divided must unify, and that which is long unified must divide (idiom, from 三國演義|三国演义)
Domain: Modern Chinese 现代汉语
Notes: (CC-CEDICT '分久必合，合久必分')