Simplify the following text for a Grade 9 native English-speaking person.
Original: For example , 2 of Chopin 's 52 mazurkas , and 1 of his nocturnes are in this key , though he seems to have preferred the related key C-sharp minor .
Simplified: 2 of Chopin 's 52 mazurkas , and 1 of his nocturnes are in this key , though he seems to have liked the related key C-sharp minor better .