Complex sentence: Though The City of God follows Christian theology, the main idea of a conflict between good and evil follows from Augustine's former beliefs in Manichaeanism, a philosophy based on the idea of primordial conflict between light and darkness or goodness and evil.
Split into simpler sentences: Though The City of God follows Christian theology, the main idea of a conflict between good and evil follows from Augustine's former beliefs in Manichaeanism. A philosophy based on the idea of primordial conflict between light and darkness or goodness and evil.