Complex sentence: Moshman proposed that there should be four possible types of processing as opposed to two: implicit heuristic processing, implicit rule-based processing, explicit heuristic processing, and explicit rule-based processing.
Split into simpler sentences: Moshman proposed that there should be four possible types of processing as opposed to two. They would be implicit heuristic processing, implicit rule-based processing, explicit heuristic processing, and explicit rule-based processing.