Complex sentence: John Erickson, The Soviet High Command, MacMillan, 1962, p.558 In 1940, Vlasov was promoted to major general, and on June 22,1941, when the Germans and their allies invaded the Soviet Union, Vlasov was commanding 4th Mechanized Corps.
Split into simpler sentences: John Erickson, The Soviet High Command, MacMillan, 1962, p.558 In 1940, Vlasov was promoted to major general. On June 22,1941, when the Germans and their allies suddenly invaded the Soviet Union, Vlasov was the commander of the 4th Mechanized Corps.