Complex sentence: A genuinely loving God would have created humans with free will; although he accepted that humans could have been created to always freely choose good, he believed that a genuine relationship requires the genuine possibility of rejection.
Split into simpler sentences: A genuinely loving God, he argued, would have created humans with free will. Hick it would be possible for God to create beings that would always freely choose to do good, but argued that a genuine relationship requires the possibility of rejection.