Complex sentence: John Clifford "Cliff" Hill is a professional rugby league footballer who played in the 1960s, and 1970s, playing at representative level for Great Britain and Lancashire, and at club level for Wigan and Oldham, as a, i.e. number 6.
Split into simpler sentences: John Clifford "Cliff" Hill is a former professional rugby league footballer who played in the 1960s and 1970s. He played at representative level for Great Britain and Lancashire, and at club level for Wigan and Oldham, as a, i.e. number 6.