Simplify the following text for a Grade 6 native English-speaking person.
Original: The 100 Books of the Century is a grading of the books considered as the hundred best of the 20th century , drawn up in the spring of 1999 through a poll conducted by the French retailer Fnac and the Paris newspaper Le Monde .
Simplified: Le Mondes 100 Books of the Century is a list of books thought to be the 100 best of the 20th century . The list was made in 1999 by the French retailer Fnac and the Paris newspaper Le Monde .