Complex sentence: Muslims invaded the Sassanid Persian Empire in April 633 A.D, under the command of Khalid ibn Walid, the army defeated the Sassanid army in two consecutive battles, Battle of Chains and Battle of River.
Split into simpler sentences: Muslims invaded the Sassanid Persian Empire in April 633 A.D, under the command of Khalid ibn Walid. They defeated the Sassanid army in two consecutive battles: the Battle of Chains and the Battle of River.