此句请帮忙找出主谓宾结构.是什么类型的句子? 谢谢!

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此句请帮忙找出主谓宾结构.是什么类型的句子? 谢谢!
Indeed,what might Mercator have thought were it suggested to him that his scheme would one day be used to plot landscapes so far from terrestrial in aspect as to reflect back,in their magnificent alienness,the very idea of an old and exhausted earth?

全句为主从复合句.下面,顺文章依次分析句子:Indeed,what might Mercator have thought (由what引出主语从句)were (系词)it (表语)suggested (过去分词,做it的后置定语)to him that (由于suggest后面需要双...