Complex sentence: One unique feature of the Aghlabids is that despite the political differences and rivalry between Aghlabids who served under Abbasid and the Umayyad Emirate of Cordoba, the Muslims in Spain were also sent a fleet under Asba' ibn Wakil to aid the Aghlabids conquest of Sicily.
Split into simpler sentences: One unique feature of the Aghlabids is that despite the political differences and rivalry between Aghlabids who served under Abbasid and the Umayyad Emirate of Cordoba. The Muslims in Spain were also sent a fleet under Asba' ibn Wakil to aid the Aghlabids conquest of Sicily.