这本来是个GRE的阅读句子，在杨鹏那本阅读训练的书上看到的，但是有一句语法看不懂，还望老师赐教。
Such variations in size, shape, chemistry, conduction speed, excitation threshold, and the like as had been demonstrated in nerve cells remained negligible in significance for any possible correlation with the manifold dimensions of mental experience.
这句话书里面将such as的组合解释为such thing as something，我的问题就是本句话as后面好像不是something而是一个句子。请问这句话的such as究竟该怎么理解？as后面是定语从句as （variations that） had been demonstrated 的省略形式吗？还请各位赐教！
