Complex sentence: He rejected the theory of class struggle and the Marxist concern with labor, instead claiming, according to Leszek Kołakowski, that since "all questions of material existence have been solved, moral commands and prohibitions are no longer relevant".
Split into simpler sentences: He rejected the theory of class struggle and the Marxist concern with labor. According to Leszek Kołakowski, Marcuse argued that since "all questions of material existence have been solved, moral commands and prohibitions are no longer relevant".