Simplify the following text for a Grade 11 native English-speaking person.
Original: Also , it was the final project and the last Tom and Jerry production to be executive produced by both , William Hanna and Joseph Barbera , as Hanna died on March 22 , 2001 , a few days later after the film 's release .
Simplified: Also , it was the final cartoon and the last Tom and Jerry cartoon to be co-executive produced by both , William Hanna and Joseph Barbera , as Hanna died in March 22 , 2001 , a few days before the film 's release .