Complex sentence: When Kim Il-sung's communist army attacked from the North in June 1950, starting the Korean War, retreating South Korean forces and anti communist groups executed the alleged-communist prisoners, along with many of the Bodo League members.
Split into simpler sentences: When Kim Il-sung's communist army attacked from the North in June 1950, starting the Korean War. Retreating South Korean forces and anti communist groups executed the alleged-communist prisoners, along with many of the Bodo League members.