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I do not know whether it is the "best" way, but at least a short and readable way to transform a set of sets S into a list of lists L:

sage: S =  Set([Set([1,2]),Set([2,3])]) ; S
{{1, 2}, {2, 3}}

sage: L = [i.list() for i in S] ; L
[[1, 2], [2, 3]]

sage: C = SimplicialComplex(L) ; C
Simplicial complex with vertex set (1, 2, 3) and facets {(1, 2), (2, 3)}