Pushed by science, or what claims to be science, society is reclassifying what once were considered character flaws or moral failings as personality disorders akin to physical disabilities.
Pushed by science, or something, [状语] society [主语] is reclassifying [谓语] something [宾语] as personality disorders [宾语补足语] akin to physical disabilities. [定语]
Something [主语] claims to be [系动词] science. [表语]
Something [主语] once [状语] were considered [谓语] character flaws or moral failings. [主语补足语]