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when television was first introduced,the extent----------it

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when television was first introduced,the extent----------it would affect society could not have been foreseen为什么要用to which ,不能用of which?这个句子结构怎么样的?能把它分成两个独立的句子吗?
when television was first introduced,the extent----------it
to some extent 这个是固定的搭配关系 这是个定语从句 先行词是 the extent 如果真的要分的话就是 to some extent when television was first introduced,it would affect society could not have been foreseen