Complex sentence: But despite the fact the two great theologians had come to terms and had celebrated their agreement with great joy, he had been rejected with scorn, a monk of Antioch now brought forward a volume of extracts from the works of Theodoret.
Split into simpler sentences: But despite the fact the two great theologians had come to terms and had celebrated their agreement, Theodoret was rejected with scorn. A monk from Antioch produced a volume of extracts from the works of Theodoret.