"离婚协议是一个复合协议,既包括解除婚姻关系的形成行为,也包括夫妻财产分割及子女抚养的附随行为。"
Divorce agreement is a compound agreement, including "形成行为", such as dissolution of marriage, and "附随行为", like division of property & child raising.
So may we take it as this:
形成行为=dissolution of marriage;
附随行为=division of property + issue of child raising;