Simplify the following text for a Grade 11 native English-speaking person.
Original: After her time on Buffy , Benson began production on a series of animation films for the BBC with co-creator Christopher Golden and animation studio Cosgrove Hall .
Simplified: After her time on Buffy , Benson began working on a series of animated movies for the BBC with co-creator Christopher Golden and animation company Cosgrove Hall .