句子分析that way you will show them that you are more grown-up than they are

(through) that way,条件状语,you will show them that,THEM是直接宾语,THAT是间接宾语,后面you are more grown-up than they are做丛句,宾语丛句,more grown-up than 是比较级结构,句意：you will show that...