Complex sentence: Charlton finished third, pipped to promotion by Blackburn Rovers by a single point, having lost their final match of the season 4--3 to Blackburn, when a draw would have seen Charlton promoted instead.
Split into simpler sentences: Charlton finished third, pipped to promotion by Blackburn Rovers by a single point. They lost their final match of the season 4--3 to Blackburn, when a draw would have seen Charlton promoted instead.