Complex sentence: Ibn al-Mustafad remained in charge of the "ahdath", but he opposed Nasr's move to make the Emirate of Aleppo a formal vassal of the Byzantine Empire in 1031.
Split into simpler sentences: Ibn al-Mustafad remained in charge of the "ahdath". He opposed Nasr's move to make the Emirate of Aleppo a formal vassal of the Byzantine Empire in 1031.