The last thirty years have seen the greatest number of laws

The last thirty years have seen the greatest number of laws stopping our rights and progress 的谓语
The last thirty years have seen the greatest number of laws stopping our rights and progress 这个句子是高一的,老师说用see有拟人色彩,那谓语have seen 是依前面的the last thirty years 还是后面的 the greatest number of laws