Simplify the following text for a Grade 7 native English-speaking person.
Original: Riddle Box is the third Joker 's Card in Insane Clown Posse 's Dark Carnival , the fictional mythology of the concept album series used in much of their discography .
Simplified: The producers of the album were Insane Clown Posse and Mike E. Clark . The album was the third of the `` Joker Cards '' in the Dark Carnival mythology .