Complex sentence: Saladin's brother Al-Adil became emir of Damascus in 1196 and he rebuilt the citadel completely between 1203 and 1216, probably to counter new developments in siege warfare.
Split into simpler sentences: Saladin's brother Al-Adil became emir of Damascus in 1196. He rebuilt the citadel completely between 1203 and 1216, probably to counter new developments in siege warfare.