Complex sentence: William "Bill" Aspinall is a professional rugby league footballer who played in the 1960s, and 1970s, playing at club level for Keighley, as a, i.e. number 13, during the era of contested scrums.
Split into simpler sentences: William "Bill" Aspinall is a former professional rugby league footballer who played in the 1960s, and 1970s. He played at club level for Keighley, as a, i.e. number 13, during the era of contested scrums.