求一句话的语法分析

问题描述:

求一句话的语法分析
As a newsboy,sailor,millhand,stoker,tramp,and janitor,he come to know all there was to know about the life of the underdog.这句话中的后半部分he come to know all there was to know about the life of the underdog不明白是什么语法结构,求分析和句意!

he come to know all
(that) there was to know
about the life of the underdog
他了解了一切
能够了解的
有关于被压迫者的生活的事情