Complex sentence: His theology, which rejected the deity described in the Jewish Scriptures as inferior or subjugated to the God proclaimed in the Christian gospel, was denounced by the Church Fathers and he was excommunicated.
Split into simpler sentences: His theology, which rejected the deity described in the Jewish Scriptures. He considered this deity to be inferior or subjugated to the God proclaimed in the Christian gospel, was denounced by the Church Fathers and he was excommunicated.