Complex sentence: David Watkinson is an English professional rugby league footballer who played in the 1970s, and 1980s, playing at representative level for Great Britain, and England, and at club level for Heworth, Hull Kingston Rovers, and Dewsbury as a, i.e. number 9.
Split into simpler sentences: David Watkinson is an English former professional rugby league footballer who played in the 1970s, and 1980s. He played at representative level for Great Britain, and England, and at club level for Heworth, Hull Kingston Rovers, and Dewsbury as a, i.e. number 9.