Complex sentence: Michael Campbell (born November 9,1978 in Kingston upon Thames, Surrey) is a retired male track and field sprinter from Jamaica, who specialized in the 200 metres and the 400 metres during his career.
Split into simpler sentences: Michael Campbell (born November 9,1978 in Kingston upon Thames, Surrey) is a retired male track and field sprinter from Jamaica. He specialized in the 200 metres and the 400 metres during his career.