Simplify the following text for a Grade 9 native English-speaking person.
Original: His works were some of the finest organ pieces to come from France in over a century , and laid the groundwork for the French symphonic organ style . In particular , his Grande PiÃ ce Symphonique , a 25 minute work , paved the way for the organ symphonies of Charles-Marie Widor , Louis Vierne , and Marcel DuprÃ .
Simplified: His organ works , especially the Grande PiÃ ce Symphonique , were some of the best organ pieces to come from France ( or anywhere else ) in over a century .