Original sentence: At the start of World War II, the Comintern supported a policy of non-intervention, arguing that the war was an imperialist war between various national ruling classes, much like World War I had been, but when the Soviet Union itself was invaded on 22 June 1941, the Comintern changed its position to one of active support for the Allies
Edited sentence: During the next two years, many communists turned their backs on the Comintern, which lost its political credibility and importance due to its failure to oppose Nazi aggression.However, when the Soviet Union itself was invaded on 22 June 1941, the Comintern changed its position to one of active support for the Allies.On October 31, the Soviet foreign minister Vyacheslav Molotov declared that it was not Nazi Germany but England and France that should be viewed as attackers.On September 3, 1939, France and Great Britain declared war on Germany after its invasion of Poland.The weakened and decimated Comintern had to officially declare on November 6 that World War II was an imperialist war between various national ruling classes on both sides, much like World War I had been, and that England and France were to blame