Complex sentence: Banu Hammed was one of the tribes that had migrated from the Arab states of the persian gulf to iran and had settled there, many of the members of the tribes have left and have come back to the Arab states.
Split into simpler sentences: Banu Hammed was one of the tribes that had migrated from the Arab states of the Persian Gulf to Iran and had settled there. Many of the members of the tribes have left and have come back to the Arab states.