Complex sentence: Harry Burton was a professional rugby league footballer who played in the 1950s, playing at club level for Lock Lane ARLFC, and Wakefield Trinity (Heritage № 588), as a, i.e. number 3 or 4.
Split into simpler sentences: Harry Burton was a professional rugby league footballer who played in the 1950s. He played at club level for Lock Lane ARLFC, and Wakefield Trinity (Heritage № 588), as a, i.e. number 3 or 4.