Complex sentence: From 1958 to 1960, while in the USMC, he raced motorcycles in Okinawa, Japan and won a championship consisting of 13 Pacer's Motorcycle Club Okinawa wins.
Split into simpler sentences: From 1958 to 1960, while in the USMC, he raced motorcycles in Okinawa, Japan and won a championship. This championship was comprised of 13 Pacer's Motorcycle Club Okinawa wins.