Simplify the following text for a Grade 7 native English-speaking person.
Original: The series was created by C. H. Greenblatt , a former storyboard artist on SpongeBob SquarePants and The Grim Adventures of Billy & Mandy .
Simplified: The show was created by C. H. Greenblatt , a former storyboard artist on SpongeBob SquarePants and The Grim Adventures of Billy & Mandy .