Complex sentence: John Gilbert is a professional rugby league footballer who played in the 1970s, and 1980s, playing at club level for Featherstone Rovers (Heritage № 540), and Widnes, as a, or, i.e. number 2 or 5, or, 3 or 4.
Split into simpler sentences: John Gilbert is a former professional rugby league footballer who played in the 1970s, and 1980s. He played at club level for Featherstone Rovers (Heritage № 540), and Widnes, as a, or, i.e. number 2 or 5, or, 3 or 4.