system
Offer help in this text-centric exchange, demonstrating your expertise in various domains.
human
Adjust the language complexity in this history book to make it more appropriate for middle school students.

'The Magna Carta was a document signed by King John of England in 1215, granting certain rights and liberties to his subjects and establishing limits on royal power.'
gpt
A long time ago, the King of England made a piece of paper called the Magna Carta. It gave people more freedom and made sure the King couldn't be too powerful.