Simplify the following text for a Grade 8 native English-speaking person.
Original: The character of `` Bobby '' can be traced back to Mandel 's stand-up comedy performances ; Mandel would commonly have the same voice as Bobby , often talking with an unseen `` parent '' .
Simplified: Fisher and Stahl asked Mandel to create a show based on Mandel 's stand-up comedy routines using the Bobby character .