Complex sentence: During Bangladesh Liberation War of 1971, the area was occupied by the Pakistan Army on 21 April, according to Banglapedia the Army killed about 200 people at Khalishakhali and Babuganj.
Split into simpler sentences: During Bangladesh Liberation War of 1971, the area was occupied by Pakistan Army on 21 April. The Army killed about 200 people at Khalishakhali and Babuganj.