Complex sentence: Dembélé was an unused substitute for the league match against Swansea on 23 November 2013 and made his Premier League debut on 30 November 2013 against West Ham, coming on as a substitute in the 83rd minute for Kieran Richardson, but finished the game with an injury.
Split into simpler sentences: Dembélé was an unused substitute for the league match against Swansea on 23 November 2013. He made his Premier League debut on 30 November 2013 against West Ham, coming on as a substitute in the 83rd minute for Kieran Richardson, but finished the game with an injury.