Complex sentence: David Roockley is a former professional rugby league footballer who played in the 1980s, playing at representative level for Yorkshire, and at club level for Castleford, as a, i.e. number 1.
Split into simpler sentences: David Roockley is a former professional rugby league footballer who played in the 1980s. He played at representative level for Yorkshire, and at club level for Castleford, as a, i.e. number 1.