Complex sentence: In 1877 he went to Paris, where he helped to start the anarchist movement, returning to Switzerland in 1878, where he edited for the Jura Federation a revolutionary newspaper Le Révolté, subsequently also publishing various revolutionary pamphlets.
Split into simpler sentences: In 1877 he went to Paris, where he helped to start the anarchist movement there. He returned to Switzerland in 1878, where he edited a revolutionary newspaper for the Jura Federation called Le Révolté, subsequently also publishing various revolutionary pamphlets.