Complex sentence: Other criticism has concentrated on the declassifying effects of postmodern culture; that consumer tastes are now less influenced by traditional social structures, and they engage in play with free-floating signifiers to perpetually redefine themselves with whatever they find pleasurable.
Split into simpler sentences: Other criticism has concentrated on the declassifying effects of postmodern culture. Consumer tastes are being less influenced by traditional social structures, and they engage in play with free-floating signifiers to perpetually redefine themselves with whatever it is that they find pleasurable.