Complex sentence: The 11th Panzer Division did not participate in the war until the invasion of Yugoslavia, fought in the Soviet Union from 1941 to 1944 and, in the last year of the war, in southern France and Germany.
Split into simpler sentences: The 11th Panzer Division did not participate in the war until the invasion of Yugoslavia. It fought in the Soviet Union from 1941 to 1944 and, in the last year of the war, in southern France and Germany.