Complex sentence: Either one can experience the joys of having continuous prosperity, much like Tellus, or one can experience a life of death, which can be granted as a reward like it was to Kleobis and Biton.
Split into simpler sentences: Either one can experience the joys of having continuous prosperity, much like Tellus. Or those can experience a life of death, which can be granted as a reward like it was to Kleobis and Biton.