Complex sentence: In subsequent runs in the National he finished fourth in 1987 and 1988, second in 1989, tenth in 1990, on each occasion between 1985 and 1989 he was ridden by Dunwoody, and on his last appearance in 1990 he was ridden by Peter Hobbs.
Split into simpler sentences: In subsequent runs in the National he finished fourth in 1987 and 1988, second in 1989, and tenth in 1990. On each occasion between 1985 and 1989 he was ridden by Dunwoody, and on his last appearance in 1990 he was ridden by Peter Hobbs.