Complex sentence: Leontes, meanwhile, has become possessed with jealousy--convinced that Polixenes and Hermione are lovers, he orders his loyal retainer, Camillo, to poison the Bohemian king.
Split into simpler sentences: Leontes, meanwhile, has become possessed with jealousy. Convinced that Polixenes and Hermione are lovers, he orders his loyal retainer, Camillo, to poison the Bohemian king.