What was the complication in brave new world?

John the Savage (a man that lived on the "reservation" meant for those who lived apart from the new world much compared to the reservations used for Native Americans today) struggles to integrate into the society of the New World. Not only with society, but with relationships as well (i.e. Lenina). He evidently fails to relinquish his old ways especially after talking to Mustapha Mond, one of the ten World Controllers, about his struggles regarding the presence of God and philosophical and scientific intellect, and hangs himself as the only respite from the horrors that he experiences.