Complex sentence: This helped him develop a response to the problem of evil from a theological (and non-Manichean) perspective, based on the writing of Saint Paul, as well as his interpretation of the first few chapters of Genesis.
Split into simpler sentences: This helped him to develop a response to the problem of evil from a theological (and non-Manichean) perspective. This response was based on the writing of Saint Paul, as well as his interpretation of the first few chapters of Genesis.