Complex sentence: Tajima made his race debut in 1968 in the All Japan Dirt Trial Championship which he won his first race and his first involvement in WRC was in the 1981 Lombard RAC Rally.
Split into simpler sentences: Tajima made his race debut in 1968 in the All Japan Dirt Trial Championship where he won his first race. His first involvement in the WRC was in the 1981 Lombard RAC Rally.