Complex sentence: After denying Mansur's request to serve as Cheif Justice in the Caliphate, Abu Hanifah was imprisoned and tortured at Mansur's request; he (Abu Hanifah) was imprisoned until his death.
Split into simpler sentences: After denying Mansur's request to serve as Cheif Justice in the Caliphate, Abu Hanifah was imprisoned and tortured at Mansur's request. He (Abu Hanifah) was imprisoned until his death.