Complex sentence: Walton was approaching 37 at the time of Accrington's demise, and decided to retire from professional football, but he continued at non-league level as player-coach of Horwich RMI.
Split into simpler sentences: Walton was approaching 37 at the time of Accrington's demise, and decided to retire from professional football. But he continued at non-league level as player-coach of Horwich RMI.