Simplify the following text for a Grade 9 native English-speaking person.
Original: This was a radical idea because it completely eliminated the three Estates structure of the French Monarchy : the clergy , the aristocracy , and the people at large represented by the Estates-General , thereby erasing the last vestige of a feudalistic structure .
Simplified: These were the aristocracy , clergy , and third estate from the estates . It abolished any vestige of a feudalistic structure .