Complex sentence: At the 1969 Isle of Man TT, Uphill won the 750 Production class, and in 1970, he won the 750 Production class at the North West 200 held in Northern Ireland.
Split into simpler sentences: At the 1969 and 1970 Isle of Man TT, Uphill won the 750 Production class. Also, in 1970 he won the 750 Production class at the North West 200 held in Northern Ireland.