Simplify the following text for a Grade 13 native English-speaking person.
Original: Television spin-offs are animated or live action television series or made for TV movies which contain either characters or theme elements from an older series or movie ( Clerks : The Animated Series , Bill and Ted 's Excellent Adventures ) .
Simplified: Television spin-offs are animated or live action television series or made for TV movies which contain either characters or theme elements from an older series or movie ( Clerks : The Animated Series ) .