Complex sentence: His duties included the invocation of her assistant deities and cult service to the earth-goddess Tellus; but Ceres was also served by priestesses and according to Cicero, men were forbidden to look on her cult image.
Split into simpler sentences: His duties included the invocation of her assistant deities and cult service to the earth-goddess Tellus. The cult was served by priestesses and according to Cicero, men were forbidden to look on Ceres' cult image.