Complex sentence: In the late 1990s he became disenchanted with the increasingly apolitical lifestylism of the contemporary anarchist movement, stopped referring to himself as an anarchist, and founded his own libertarian socialist ideology called Communalism.
Split into simpler sentences: In the late 1990s he became disenchanted with the increasingly apolitical lifestylism of the contemporary anarchist movement and stopped referring to himself as an anarchist. Instead, he founded his own libertarian socialist ideology called Communalism.