Complex sentence: He acted as a bodyguard to the King during Jack Cade's Rebellion, and both negotiated with the rebels for the government and, when the rebellion was over, helped investigate the causes of the revolt.
Split into simpler sentences: He acted as a bodyguard to the King during Jack Cade's Rebellion. He negotiated with the rebels for the government and, when the rebellion was over, helped investigate the causes of the revolt.