Complex sentence: It has been shown that executive functioning is directly related to the frontal and prefrontal cortices and that dopamine influences many executive functions including attention, motor activity, social behavior, and perception of the outside world.
Split into simpler sentences: It has been shown that executive functioning is directly related to the frontal and prefrontal cortices. Dopamine has been shown to influence many executive functions including attention, motor activity, social behavior, and perception of the outside world.