Complex sentence: His first game in charge ended in a 1--0 home defeat to former club Chester City three days later, when he had a disagreement with the referee at the final whistle resulting in a touchline ban.
Split into simpler sentences: His first game in charge ended in a 1-0 home defeat to former club Chester three days later. In this game, he had disagreements with the referee at the final whistle resulting in a touchline ban.