请问下这个句子的结构 Societies offer a great chance to meet people from outside college,which...

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请问下这个句子的结构 Societies offer a great chance to meet people from outside college,which...
请问下这个句子的结构 Societies offer a great chance to meet people from outside college,which,especially for arts students,is something it is sometimes difficult to do .我知道这是一个非限制性定语从句,especially for arts students 是一个插入语,但是后面的 is something it is sometimes何解?it is sometimes 在句子中做何成分,

您好,2012年11月11日晚22点30分问题敬悉.这是一个复合句,which,(especially for arts students), is something it is sometimes difficult to do 是个非限制性定语从句,which 是代词,代指主句的整个部分(Societie...没有的,that 是代词,代指something, it 同样可以充当这个功能,只不过现在的英语教材多采用英式英语,比较正规,但是, 在美式英语中,就没那么多规矩了,it同样是可以的。