Original sentence: A military coup occurred during which a mixed but predominantly Igbo group of army officers assassinated 30 political leaders, including Nigeria's Prime Minister, Sir Abubakar Tafawa Balewa, and the Northern premier, Sir Ahmadu Bello.Following independence, Nigeria was demarcated primarily along ethnic lines: Hausa and Fulani majority in the north, Yoruba majority in the West, and Igbo majority in the East.The commander of the army, General Aguiyi Ironsi seized power to maintain order.The predominantly Muslim officers named a General from a small ethnic group (the Angas) in central Nigeria, General Yakubu "Jack" Gowon, as the head of the Federal Military Government (FMG).The southern population is predominantly Christian, being primarily made up of territory of the indigenous Yoruba and Igbo states in the west and east respectively.The two coups deepened Nigeria's ethnic tensions
Edited sentence: A military coup occurred led by Igbo group of army officers as they assassinated 30 political leaders in the killing spree.Following independence, Nigeria was demarcated primarily along ethnic lines: Hausa is majority in the north, Yoruba majority in the West, and Igbo majority in the East.The commander of the army, General Aguiyi Ironsi seized power to become the first military dictator.The coups was a retaliation of the massacre of Northern leaders by Igbos which leads to Nigeria's ethnic tensions.The predominantly Muslim officers named a General from an ethnic group (the Angas) in central Nigeria, General Yakubu "Jack" Gowon, as the head of the Federal Military Government (FMG).The southern population is predominantly Christian, being primarily made up of territory of the indigenous Yoruba, Edo, Efik, Ijaw, and Igbo states in the west and east respectively.They killed Fulani Emir Sir Ahmadu Bello, Yoruba Leader Ladoke Akintola including Nigeria's Prime Minister, Sir Abubakar Tafawa Balewa