Simplify the following text for a Grade 9 native English-speaking person.
Original: The cornet is sometimes erroneously considered to be the `` valved version '' of the bugle , although it was derived from the French cornet de poste ( post horn ) .
Simplified: The cornet is sometimes wrongly considered to be the `` valved version '' of the bugle , although it comes from the French cornet de poste ( post horn ) .