Complex sentence: Mussolini denounced the PSI, his views now centering on nationalism instead of socialism and later founded the fascist movement which came to oppose egalitarianism and class conflict, instead advocating revolutionary nationalism transcending class lines.
Split into simpler sentences: Mussolini denounced the PSI, his views now centering on nationalism instead of socialism, and later founded the fascist movement. He came to oppose egalitarianism and class conflict, instead advocating revolutionary nationalism transcending class lines.