Complex sentence: Tiribazus found a solution to resolve the campaign and save the King's army, he knew that the Cadusii were divided between two rival chiefs so he sent his son to negotiate with one while he negotiated with the other.
Split into simpler sentences: Tiribazus found a solution to resolve the campaign and save the King's army. He knew that the Cadusii were divided between two rival chiefs so he sent his son to negotiate with one while he negotiated with the other.