Complex sentence: Muslim commentator Abdullah Yusuf Ali considers the treaty to have been already violated, probably by an attack by the Quraysh-allied tribe of Banu Bakr upon the Muslim tribe of Banu Khuza'a, necessitating divine instruction on what was to be done with migrants from Mecca.
Split into simpler sentences: Muslim commentator Abdullah Yusuf Ali considers that the treaty had already been violated, probably by an attack by the Quraysh-allied tribe of Banu Bakr upon the Muslim tribe of Banu Khuza'a. Thus he believed that divine instruction was needed on what was to be done with migrants from Mecca.