Complex sentence: Bourassa then created "Le Devoir" as an outlet for Quebec nationalism, the first issue appearing on January 10,1910, in which he opposed involvement in World War I and the adoption of conscription during the war (see Conscription Crisis of 1917).
Split into simpler sentences: Bourassa then created "Le Devoir" as an outlet for Quebec nationalism, the first issue appearing on January 10,1910. During World War I, Bourassa criticized Canada's involvment and the adoption of conscription (see Conscription Crisis of 1917).