Complex sentence: Ikrimah met with the leadership of the Bani Muharib faction and convinced them to return to Islam, and after this event the army under Ikrimah command and the Bani Muharib faction formed military alliance against the Bani Shakhrah.
Split into simpler sentences: Ikrimah met with the leadership of the Bani Muharib faction and convinced them to return to Islam. After this event, the army under Ikrimah's command, and the Bani Muharib faction, formeda military alliance against the Bani Shakhrah.