how and why is Bernard different from Brave New World? he is different because look at his behavior, when he returns from the savage reservation with John, but still i need more?
"how and why"
You need to include specifics. If all you say is "look at his behavior" you'll likely get a zero on the question.
how = tell what he was like before; tell what he was like afterward. BE SPECIFIC and INCLUDE DETAILS
why = what caused the changes?