Complex sentence: Charles "Charlie" Rees was a Welsh professional rugby league footballer who played in the 1910s, 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: Charles "Charlie" Rees was a Welsh professional rugby league footballer who played in the 1910s. 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.