Complex sentence: David "Dai" Thomas was a Welsh professional rugby league footballer who played in the 1900s, playing at representative level for Other Nationalities, and at club level for Oldham, as a, i.e. number 11 or 12.
Split into simpler sentences: David "Dai" Thomas was a Welsh professional rugby league footballer who played in the 1900s. He played at representative level for Other Nationalities, and at club level for Oldham, as a, i.e. number 11 or 12.