His function is analogous to that of a judge, who must accept the obligation of revealing in as obvious a matter as possible the course of reasoning which led him to his decision.
Step one：谓语动词is, must accept, led
Step two:连接词who, which
1. 句子主干：his function is analogous to that of a judge，his指代知识分子，That为代词 指代function；
2. who引导定语从句修饰judge，其中of revealing...为介词短语（介词+动名词）的形式，修饰obligation；
3. in as obvious a matter as possible是介词结构将revealing和其宾语the course of reasoning分隔开来，形成了隐性分割结构；
4. which引导定语从句修饰the course of reasoning，该定语从句较短，翻译时直接放在先行词之前。
【每日打卡】考研英语长难句 DAY 189