the human problems that repeat themselves in life repeat themselves in literature什么意思?

在人们生活中反反复复出现的问题在人类的文化中也同样反复体现出来.
1.that repeat themselves in life是定语从句,修饰the human problems
2.主句是:the human problems repeat themselves in literature

先行词that引导repeat themselves in life和repeat themselves in leterature两个修饰短语来修饰the human problems

还可以理解为：
由that引导的repeat themselves in life短语做后置定语修饰the human problems,而句子的主干部分the human problems repeat themselves in literature

。。。that repeat themselves in life 是主语从句，修饰主语the human problems