Complex sentence: John Hennessey was a Welsh professional rugby league footballer who played in the 1920s, playing at representative level for Wales, and at club level for Rochdale Hornets, as a, i.e. number 11 or 12, during the era of contested scrums.
Split into simpler sentences: John Hennessey was a Welsh professional rugby league footballer who played in the 1920s. He played at representative level for Wales, and at club level for Rochdale Hornets, as a, i.e. number 11 or 12, during the era of contested scrums.