Simplify the following text for a Grade 10 native English-speaking person.
Original: Opera buffa was a parallel development to opera seria and arose in reaction to the so-called first reform of Zeno and Metastasio .
Simplified: Opera buffa contrasts with opera seria ( â serious operaâ ) in which the story was a tragedy . Opera seria was supposed to be â seriousâ , while opera buffa was an entertaining musical comedy .