Complex sentence: 'Amr ibn Imru' al-Qays was the third Lakhmid king of al-Hirah, reigning in 328--363.n of the famed Imru'al-Qays ibn' Amr who had defected to the Roman Empire, he returned to Sassanid allegiance.
Split into simpler sentences: 'Amr ibn Imru' al-Qays was the third Lakhmid king of al-Hirah, reigning in 328--363. A son of the famed Imru'al-Qays ibn' Amr who had defected to the Roman Empire, he returned to Sassanid allegiance.