Complex sentence: GROW's literature includes the Twelve Stages of Decline, which indicate that emotional illness begins with self-centeredness, and the Twelve Steps of Personal Growth, a blend of AA's Twelve Steps and will-training methods from Recovery International.
Split into simpler sentences: GROW's literature describes the Twelve Stages of Decline, and indicates that emotional illness often begins with self-centeredness. The Twelve Steps of Personal Growth, is a blend of AA's Twelve Steps and will-training methods from Recovery International.