Complex sentence: The goddess tells him that she wishes him well, but adds, as decreed by Zeus, he can only invoke her aid three times, and directs him to search for the Fleece in the land of Colchis.
Split into simpler sentences: The goddess tells him that she wishes him well, but adds, as decreed by Zeus, he can only invoke her aid three times. She directs him to search for the Fleece in the land of Colchis.