Complex sentence: Bohemond died fighting against Danishmend Emir Gazi Gümüshtigin during a military campaign against Cilician Armenia, and Gümüshtigin sent Bohemond's embalmed head to the Abbasid Caliph.
Split into simpler sentences: Bohemond died fighting against Danishmend Emir Gazi Gümüshtigin during a military campaing against Cilician Armenia. His victorous enemy sent Bohemond's embalmed head to the Abbasid Caliph.