Complex sentence: Of these, the 1921 "Le Couteau entre les dents" ("The Knife Between the Teeth") marks Barbusse's siding with Bolshevism and the October Revolution; he joined the French Communist Party in 1923 and later travelled to the Soviet Union.
Split into simpler sentences: Of these, the 1921 "Le Couteau entre les dents" ("The Knife Between the Teeth") marks Barbusse's siding with Bolshevism and the October Revolution. He joined the French Communist Party in 1923 and later travelled back to the Soviet Union.