Complex sentence: Appreciative inquiry has been shown to trigger male employees to show greater task involvement and creativity, but trigger lower task creativity in female employees and at the group level, it has been shown to increase group identification and estimates of group potency.
Split into simpler sentences: Appreciative inquiry has been shown to promote greater task involvement and creativity in male employees, but lower task creativity in female employees. At the group level, it has been shown to increase group identification and group potency.