Complex sentence: In Book 6, Aeneas, with the guidance of the Cumaean Sibyl, descends into the underworld through an opening at Cumae; there he speaks with the spirit of his father and is offered a prophetic vision of the destiny of Rome.
Split into simpler sentences: In Book 6, Aeneas, with the guidance of the Cumaean Sibyl, descends into the underworld through an opening at Cumae. There he speaks with the spirit of his father and is offered a prophetic vision of the destiny of Rome.