Question

这一句怎么解析？句子语法结构是怎么样的？in which 是什么成份

Answer 1

that引导的宾语从句， in which 引导的非限制性定语从句。

追问

能详细点吗？

Answer 2

But in her new book Join the Club，状语，其中Join the Club是her new book的同位语
Tina Rosenberg 主句主语 contends 谓语 that 连词引导宾语从句
peer pressure 从句主语can also be谓语 a positive force 表语 through what she calls the social cure宾语从句做through的宾语，整个介词短语做从句状语
in which 介词+关系代词引导非限制性定语从句 organizations and officials 从句主语use 从句谓语the power of group dynamics 从句宾语to help individuals improve their lives and possibly the word从句宾语补足语.
句子看起来比较长，但其实结构还是比较清晰的。