Question

请帮忙分析一下这个英语句子结构

In 1997 the removal of that ill-defined crime from the statute books lifted what was, in effect, a ban on homosexual activity.

Answer 1

In 1997（时间状语）the removal of that ill-defined crime from the statute books（主句主语）lifted（主句谓语）what was, in effect, a ban on homosexual activity（宾语从句——主句谓语动词 lifted 的宾语）.
the removal（主句主语名词）of that ill-defined crime（介词短语修饰 the removal）from the statute books（介词短语修饰 that ill-defined crime）
宾语从句 what（从句主语）was（从句谓语 be 动词）, in effect（状语插入语）, a ban on homosexual activity（从句表语）