Complex sentence: Both Plato and Aristotle argue against some of Protagoras' claims regarding relativity, however, they argue that the concept provides Protagoras with too convenient an exemption from his own theory, and that relativism is true for him yet false for those who do not believe it.
Split into simpler sentences: Both Plato and Aristotle argue against some of Protagoras' claims regarding relativity, however. They argue that the concept provides Protagoras with too convenient an exemption from his own theory, and that relativism is true for him yet false for those who do not believe it.