The white house named Dr.Faden chairperson of the federal advisory committee of experts they assigned to do a report on the history of the goverment's radiation experiments on humans in the 1950's and 1960's.

答案是把划线部分改为it assigned to do

我知道意思应该是白宫让这个人完成某个任务,it 应该指代white house

但是这里没有任何标点，it 引出后面的部分究竟怎么理解呢？

希望GGJJ指点~谢谢

The white house named Dr.Faden chairperson of the federal advisory committee of experts (whom) it assigned to do a report on the history of the goverment's radiation experiments on humans in the 1950's and 1960's.

I think "it..." modified the "comittee of experts".