Complex sentence: Following the first 9 hour race in 1955 were 2 more Thruxton 9 hour races in 1956 and 1957, next in 1958 the famous Thruxton 500 came into being, the first of many.
Split into simpler sentences: Following the first 9 hour race in 1955 were 2 more Thruxton 9 hour races in 1956 and 1957. In 1958 the famous Thruxton 500 came into being, the first of many.