Complex sentence: Peter Foster is a professional rugby league footballer who played in the 1950s, playing at representative level for Great Britain, and at club level for Leigh, as a, i.e. number 13, during the era of contested scrums.
Split into simpler sentences: Peter Foster is a former professional rugby league footballer who played in the 1950s. He played at representative level for Great Britain, and at club level for Leigh, as a, i.e. number 13, during the era of contested scrums.