Tom drinks a lot everyday,which his wife doesn’t like at all

which his wife doesn't like at all是个非限定性定语从句,which是引导该定语从句的关系代词,指的是前面整个句子,如果要还原的话,可以用it来代替：
His wife doesn't like it at all.
如果要用从句进行还原,就只能改成宾语从句了,at all 作为状语,位置灵活,再此应该提前的,因为如果放在后面,会引起歧义,会把它当成从句的状语.
His wife doesn't like at all (that) Tom drinks a lot everyday.（连接词that可以省略）