Complex sentence: Gareth Owen is a professional rugby league footballer who played in the 1970s, and 1980s, playing at representative level for Wales, and at club level for Oldham, as a, i.e. number 8 or 10, during the era of contested scrums.
Split into simpler sentences: Gareth Owen is a former professional rugby league footballer who played in the 1970s, and 1980s. He played at representative level for Wales, and at club level for Oldham, as a, i.e. number 8 or 10, during the era of contested scrums.