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句子成分He helped popularize the idea that some diseases not pre

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句子成分
He helped popularize the idea that some diseases not preciously thought to have a bacterial cause were actually infections,which aroused much controversy when it was firse suggested.
这句话里的“not previously thought to have a bacterial cause”应该是什么成分呢?我知道这个应该是修饰diseases的,但是在这个同位语从句中它的成分不太明白,难道只是定语从句省略了“that were”么?
thought to have a bacterial cause是动词的过去分词形式作定语,相当于定语从句.