Complex sentence: Thomas Durkin was a professional rugby league footballer who played in the 1920s, playing at club level Wakefield Trinity (Heritage № 279), as a, i.e. number 11 or 12.
Split into simpler sentences: Thomas Durkin was a professional rugby league footballer who played in the 1920s. He played at club level Wakefield Trinity (Heritage № 279), as a, i.e. number 11 or 12.