Complex sentence: David Treasure is a professional rugby league footballer who played in the 1970s, playing at representative level for Wales, and at club level for Bradford Northern, and Oldham, as a, or, i.e. number 3 or 4,6, or 7.
Split into simpler sentences: David Treasure is a former professional rugby league footballer who played in the 1970s. He played at representative level for Wales, and at club level for Bradford Northern, and Oldham, as a, or, i.e. number 3 or 4,6, or 7.