Complex sentence: Rees Thomas was a Welsh professional rugby league footballer who played in the 1940s, and 1950s, playing at representative level for Wales, and at club level for Swinton and Wigan, as a, i.e. number 7.
Split into simpler sentences: Rees Thomas was a Welsh professional rugby league footballer who played in the 1940s, and 1950s. He played at representative level for Wales, and at club level for Swinton and Wigan, as a, i.e. number 7.