Complex sentence: Seneca's Cerberus, like Ovid's reacts violently to his first sight of daylight, the peviously docile Cerberus, frightened by the light struggles furiously, and Heracles, with Theseus' help, must drag Cerberus into the light.
Split into simpler sentences: Seneca's Cerberus, like Ovid's reacts violently to his first sight of daylight. The peviously docile Cerberus, frightened by the light struggles furiously, and Heracles, with Theseus' help, must drag Cerberus into the light.