Complex sentence: Keith Slater is a professional rugby league footballer who played in the 1960s, and 1970s, playing at representative level for Yorkshire, and at club level for Wakefield Trinity (Heritage № 751), as a, i.e. number 2 or 5.
Split into simpler sentences: Keith Slater is a former professional rugby league footballer who played in the 1960s, and 1970s. He played at representative level for Yorkshire, and at club level for Wakefield Trinity (Heritage № 751), as a, i.e. number 2 or 5.