Complex sentence: Marty Tripes (born June 29,1956 in San Diego, California) was a leading AMA motocross and Supercross rider of the 1970s and early 1980s.
Split into simpler sentences: Marty Tripes (born June 29,1956 in San Diego, California) is an American former professional motocross racer. He competed in AMA motocross and Supercross championships in the 1970s and early 1980s.