Complex sentence: The unit participated in large battles of summer 1944, during the Finnish-Soviet Continuation War, when the Soviet Red Army launched its fourth strategic offensive on 9 June 1944 C. G. E. Mannerheim asked Germany for help.
Split into simpler sentences: The unit participated in large battles of summer 1944, during the Finnish-Soviet Continuation War. When when the Soviet Red Army launched its fourth strategic offensive on 9 June 1944 C. G. E. Mannerheim asked Germany for help.