找一句英语定语从句要求复杂一点,难一些,有讲解和分析以及准确的翻译

The concept that one could prove theorems of angles and lines that were in no way obvious made an "indescribable impression" on the young student.
原来人可以证明那些不易明显看出的角度和线段的定理——这个想法给年青学生留下了“难以磨灭的印象”.
这里有两个定语从句
第一个：that one could prove theorems of angles and lines that were in no way obvious
这个定语从句修饰前面的“concept”
第二个定语从句在第一个之中：
that were in no way obvious
这个定语从句修饰"angles and lines"

你可以看一看新概念英语一，后面几篇文章，比如A man in a hat ,Tom's breakfast.都是非常不错的文章。里面有很都定语从句的例子，很经典，也有讲解和练习，最好背一背这些文章。后面也有宾语从句，我就不多说了。

please notice me how I can get girl that sat behind you at the day I was either in reading room at last sunday.
这句够长了吧！
please notice me know how I can get girl
告诉我怎样才能找那么女孩
that sat ...