分析一下这个英语句子的结构However, his principles are still those on whic

含定语从句的表语从句
However,his principles are （those on which morden computers are built）.
()里的是are的表语,still是副词,可以不用看它
those （on which morden computers are built）
（）是修饰those的定语从句,只不过把介词on提前了,相当于which morden computers are built on
整句话可以翻译成,然而他的那些原理仍然是现代计算机建立的基础.

his principles 为主语are 系动词those为表语on which morden computers are built.是those的定语