the book was written by a famous scienti
I got a lot of useful information from it.
显然,第二句中,it 是作from 介宾的.
是宾语.
但是:
which/that I got a lot of useful information from
是作主句中book的定语,
这一点不要弄混了.
在原句中成分,和在从句是是不一样的.