Complex sentence: David Chester is a professional rugby league footballer who played in the 1970s, playing at club level for Wakefield Trinity (Heritage № 811), as a, i.e. number 8 or 10.
Split into simpler sentences: David Chester is a former professional rugby league footballer who played in the 1970s. He played at club level for Wakefield Trinity (Heritage № 811), as a, i.e. number 8 or 10.