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simplifying a simplicial set

The starting point to this question is a simplicial set with a large number of simplices. Sage is still computing exactly how many, but in dimension 4 there are more than 100,000 simplices. Is there a command similar to X.shrink_simplicial_complex(K), but for which the input is already a simplicial set? I am fairly certain this simplicial set description of a cell complex can be described much, much more efficiently. I would like to be able to compute homology and cohomology, but my guess is that this won't be feasible unless I can first simplify.