Complex sentence: George Whitney was a Welsh professional rugby league footballer who played in the 1920s, playing at representative level for Wales, and at club level for Salford, as a, i.e. number 13, during the era of contested scrums.
Split into simpler sentences: George Whitney was a Welsh professional rugby league footballer who played in the 1920s. He played at representative level for Wales, and at club level for Salford, as a, i.e. number 13, during the era of contested scrums.