定语从句是哪部分at the plice station i saw the man from whose room t

At the police station I saw the man from whose room the thief had stolen the TV set.
from whose room the thief had stolen the TV set是定语从句,修饰the man,全句的意思是:在警察局我看见了那个小偷从他房间偷了电视机的男人.