帮我分析下这句英文从句的结构Toclassifyparentingasapersonalchoiceforwhichthereisnocollectiveresponsibilityisnotmerelytoingorethesocialbenefitsofgoodparenting.为什么是forwhich,后边从句therebe句型又该

　　帮我分析下这句英文从句的结构

　　Toclassifyparentingasapersonalchoiceforwhichthereisnocollectiveresponsibilityisnotmerelytoingorethesocialbenefitsofgoodparenting.

　　为什么是forwhich,后边从句therebe句型又该咋讲?先行词是?整个句子的结构又改咋分析?