Complex sentence: Adams began racing at Cajon Speedway near San Diego, California in 1962, eventually racing concurrently in both Super Stocks and open wheel Modified Sportsman classes and winning feature events in both before moving into CRA Sprint Cars.
Split into simpler sentences: Adams began racing at Cajon Speedway near San Diego, California in 1962 and won races in both Super Stocks and the open wheel Modified Sportsman class. He raced concurrently in both classes at Cajon Speedway before moving into CRA Sprint Cars.