Complex sentence: In the film, a fictional singing group called The Wonders star as Cap'n Geech and The Shrimpshack Shooters in a movie within the movie titled Weekend at Party Pier which features characters similar to Frankie Avalon and Annette Funicello.
Split into simpler sentences: In the film, a fictional singing group called The Wonders star as Cap'n Geech and The Shrimpshack Shooters. The movie within the movie is titled Weekend at Party Pier and features characters similar to Frankie Avalon and Annette Funicello.