about the structure "such things as something"
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.
how to understand this structure in the sentence??
thanks

Question

Answer

main verb = remained
predicate = negligible

Everything before the main verb is the subject. The subject contains a subordinate clause: "as had been introduced by nerve cells".

The rest you can work out for yourself