Complex sentence: This is the only Simpsons episode in which the same person has been accredited with two different names, where James L. Brooks is credited as the Executive Producer and Executive Creative Consultant, and again as "Jim Brooks" as a Special Guest Voice.
Split into simpler sentences: This is the only episode in which the same person has been accredited with two different names. Credited as "James L. Brooks" as the Executive Producer and Executive Creative Consultant, and credited as "Jim Brooks" as a Special Guest Voice.