Complex sentence: He was the leader of the tribe of Bareg.and an extremely successful military general during the reign of Rashidun Caliph Umar.Hamidh also fought under Sa'd's command against the Sassanid army at the Battle of al-Qādisiyyah.
Split into simpler sentences: He was the leader of the tribe of Bareg.and an extremely successful military general during the reign of Rashidun Caliph Umar. Humaydah also fought under Sa'd's command against the Sassanid army at the Battle of al-Qādisiyyah.