Complex sentence: He served as a commander in Khurasan against the Turgesh under both Asim ibn Abdallah al-Hilali and later under Asad ibn Abdallah al-Qasri, commanding the eponymous baggage train in the Battle of the Baggage in September 737, a heavy defeat for the Muslims.
Split into simpler sentences: He served as a commander in Khurasan against the Turgesh under both Asim ibn Abdallah al-Hilali and later under Asad ibn Abdallah al-Qasri. Under Asad he commanded the eponymous baggage train in the Battle of the Baggage in September 737, a heavy defeat for the Muslims.