Complex sentence: He was among the first champion racer of the early years of racing in the Philippines, driving his 1954 Studebaker on the oval of the Santa Ana Hippodrome in Manila (when the horses were not running) in the first organized auto races.
Split into simpler sentences: He was among the first champion racer of the early years of racing in the Philippines, driving his 1954 Studebaker on the oval of Sta. Ana Race track (when the horses were not running) in the first organized auto races.