英语句子结构问题

Question

more and more people have access to the Internet through which they look for the information they need

这个句子有毛病吗？是什么从句呢，有点看不懂后边。

Answer 1

非限制性定语从句（主语从句）+定语从句

more and more people(主语) have access to the Internet through（建议改成 by） by which   which 是指前面的Internet ， 翻译：越来越多的人通过互联网 

to look for the information they need(定语后置) 修饰信息，他们需要的信息。

完整修改：More and more people(主语) have access to the Internet , by which  to look for the information they need.

Answer 2

internet 是先行词， through which ... 定语从句 ,； information 是先行词 they need 是定语从句，省略了连词that.
越来越多的人可以利用互联网查找他们需要的信息。