Complex sentence: William "Billy" J. Williams was a Welsh professional rugby league footballer who played in the 1900s, playing at representative level for Wales, and at club level for Halifax, as a, i.e. number 2 or 5.
Split into simpler sentences: William "Billy" J. Williams was a Welsh professional rugby league footballer who played in the 1900s. He played at representative level for Wales, and at club level for Halifax, as a, i.e. number 2 or 5.