Simplify the following text for a Grade 9 native English-speaking person.
Original: Kirby is the main protagonist of Nintendo 's Kirby video game series created by Masahiro Sakurai and developed by HAL Laboratory . The Kirby series is one of Nintendo 's many well-known game franchises , spanning nearly twenty games since 1992 .
Simplified: Kirby is a fictional character in a series of video games published by Nintendo .