“I think highly of those who are seaching for the Amber ROOM.”
“我很尊敬那些正在寻找琥珀宫的人们.”
I think highly of those who (相当于people that）主句
I think highly of those people
我很尊敬那些人.
哪些人?
所以用that引导定语从句,修饰those people.
that are searching for the Amber Room."正在寻找琥珀宫的人们”从句
把主句和从句连接到一起,
就是：I think highly of those （people that ）are searching for the Amber Room.
我很欣赏那些正在寻找琥珀宫的人们.
those people that = those who
所以,这句话就是 I think highly of those who are searching for the Amber Room.