Question

请帮忙讲解一下这个英语句子的结构，以及前半部分的两个by的作用~~~详细一点，谢谢了！

Frustrated by the old-boy network by which Minnesota judges were always appointed , Page challenged the system in court and was eventually elected judge in the Supreme Court

Answer 1

　　An old boy network, or society (also old boys' club), can refer to social and business connections among former pupils of male-only private schools. 校友关系网
　　明尼苏达州的法官本来总是由联谊会任命的，由于对这一体系不满，佩奇在法庭上对此提出了质疑，并终于获选为最高法院的法官
第二个by which 是 介词+which 引导的定语从句 修饰 network
第一个在被动句中 引出句子主语
望采纳！

Answer 2

Minnesota judges were always appointed by the old-boy network,
Page was frustrated by the old-boy network so that he challenged the system in court and was eventually elected judge in the Supreme Court
不知道这样写你能理解吗，

Answer 3

by the old-boy network是介词短语做状语修辞frustrated，by which...是定语从句修辞the old-boy network的，主句是Page challenged the system and was elected judge...