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这属于一个长难句。主句是:The success of Sci-Hub shows ,宾语从句是:the legal ecosystem has lost legitimacy among its users. 非限制性定语从句是:which relies on researchers ... accessed, 定语从句中:关系代词which代替The success of Sci-Hub在定从中作主语,relies on 谓语,researchers 宾语,passing on copies 宾语补足语,they have themselves legally accessed 定语从句,修饰copies,关系代词that由于作accessed宾语,省去了。
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