The Greeks assumed that the structure of language had some connection with the process of thought, which took root in Europe long before people realized how diverse languages could be.

【重点词汇】 assume 假设 have connection with 与...有联系 take root in 扎根于 diverse 多样的

【结构分析】句子主干：The Greeks assumed that the structure of language had some connection with the process of thought，that引导宾语从句，其中，the structure of language为主语，had some connection with为谓语动词，the process of thought为宾语

修饰成分：which took root in Europe为which引导的定语从句修饰前面的句子; long before people realized how diverse languages could be为long before引导时间状语修饰前面的动词took root in，其中how diverse languages could be为how引导的宾语从句。

【参考译文】希腊人认为，语言结构与思维进程有关系，这种观点早在人们意识到语言的多样性之前就扎根于欧洲。