Complex sentence: Despite strong pacifist sentiment after World War I, its aftermath still caused irredentist and revanchist nationalism in several European states.These sentiments were especially marked in Germany because of the significant territorial, colonial, and financial losses incurred by the Treaty of Versailles.
Split into simpler sentences: Despite strong pacifist sentiment after World War I, its aftermath still caused irredentist and revanchist nationalism to become important in several European states. Irredentism and revanchism were strong in Germany because of the significant territorial, colonial, and financial losses incurred by the Treaty of Versailles.