Complex sentence: He alienated himself from the Byzantines, and sought to improve relations with the West, and in 1077 he was recognized as "King" by controversial Pope Gregory VII, in the aftermath of the Church schism of 1054.
Split into simpler sentences: He alienated himself from the Byzantines and sought to improve relations with the West. In 1077 he was recognized as "King" by Pope Gregory VII in the aftermath of the Church schism of 1054.