Simplify the following text for a Grade 11 native English-speaking person.
Original: The plot of the trilogy consists of the Guardians of Time ( the Guard ) , trying to protect the past , present , and future by traveling into the past to thwart their enemies , the Order of Chaos ( the Order ) , who are trying to change past events to give themselves more power .
Simplified: The trilogy is about a group of people called the Guardians of Time ( the Guard ) , going into history to save the world from the Order of Chaos ( the Order ) , who are trying to history to give themselves more power .