Original sentence: After 1302 it was sometimes called the Kingdom of Trinacria(the English equivalent word of Trinacria is the Triangle).On March 25 1139, Innocent was forced to acknowledge the kingship and possessions of Roger with the Treaty of Mignano.Roger spent most of the decade beginning with his coronation and ending with the Assizes of Ariano, a series of laws with which Roger intended to centralise the government, fending off one invader or other and quelling rebellions by his premier vassals: Grimoald of Bari, Robert of Capua, Ranulf of Alife, Sergius of Naples and others.She was sister and heiress of the deposed king William III of Sicily.The Hohenstaufen grip on power, however, was not secure.The rival  of Anacletus, Pope Innocent II in 1136 convinced Lothair III the Holy Roman Emperor to attack the Kingdom of Sicily with help from the Byzantine Emperor John II Comnenus
Edited sentence: After 1302 it was sometimes called the Kingdom of Trinacria (the English equivalent word of Trinacria is the Triangle).On March 25, 1139, Innocent was forced to acknowledge the kingship and possessions of Roger with the Treaty of Mignano.Roger spent most of the decade, beginning with his coronation and ending with the Assizes of Ariano, a series of laws with which Roger intended to centralise the government, fending off one invader or other and quelling rebellions by his premier vassals: Grimoald of Bari, Robert of Capua, Ranulf of Alife, Sergius of Naples and others.She was sister and heiress of the deposed King William III of Sicily.The Hohenstaufen's grip on power, however, was not secure.The rival  of Anacletus, Pope Innocent II, in 1136 convinced Lothair III the Holy Roman Emperor to attack the Kingdom of Sicily with help from the Byzantine Emperor John II Comnenus