Original sentence: During the first two seasons of The Simpsons, Bart was the show's main character; while later episodes started to focus more on Homer, Bart remains one of the most enduring characters on the series, and has proven to be one of the most iconic characters in the history of American television animation
Edited sentence: During the first two seasons of The Simpsons, Bart was the show's main character; while later episodes started to focus more on Homer (mostly his stupidity), Bart remains one of the most enduring characters on the series, and has proven to be one of the most iconic characters in the history of American television animation