Complex sentence: Additionally, positive affects play a central role in AEDP's conceptualization of healing, because they provide rewarding motivation through the release of dopamine, and potentiate optimal right brain functioning, thereby promoting greater freedom of expression and attunement to the emotions of others.
Split into simpler sentences: Additionally, positive affects play a central role in healing, because through their release of rewarding neurotransmitters (dopamine), they potentiate optimal right brain functioning. The observed outcome is greater freedom of expression and attunement to the emotions of others.