Complex sentence: After college, Rio returned home and began volunteering coaching at Christopher Columbus High School (Miami), where his two younger brothers attended and wrestled, and also began a career in security as a bouncer at various nightclubs in the Coconut Grove and South Beach areas.
Split into simpler sentences: After college, Rio returned home and began volunteering coaching at Christopher Columbus High School (Miami), where his two younger brothers attended and wrestled. During that time he also began a career in security as a bouncer at various nightclubs in the Coconut Grove and South Beach areas.