Simplify the following text for a Grade 9 native English-speaking person.
Original: In a 1999 interview , Rowling stated that Draco is based on several prototypical schoolyard bullies she encountered and Snape on a sadistic teacher of hers who abused his power .
Simplified: In a 1999 interview , Rowling stated that Draco is based on several schoolyard bullies she had known and Snape on a teacher of hers who abused his power .