Original sentence: The drain of these taxes weakened the kingdom's power, and the country was conquered, in 1091, by the Almoravids, after the Almoravids ravaged the city of Seville and Al-Mu'tamid ordered his sons to give up the royal fortress (early Alcazar of Seville) for saving their lifes
Edited sentence: The drain of these taxes weakened the kingdom's power, and the country was conquered, in 1091, by the Almoravids, after the Almoravids ravaged the city of Seville and Al-Mu'tamid ordered his sons to give up the royal fortress (early Alcazar of Seville) for saving their lives