Complex sentence: The last shot of the episode is the final humiliation for Riley--a poster for the Billy Matthews story (starring Haley Joel Osment) showing Billy shooting a spectacular jump shot against an obese klutz made to look like Riley.
Split into simpler sentences: The last shot of the episode is the final humiliation for Riley. It features a poster for the Billy Matthews story (starring Haley Joel Osment as Billy) showing Billy shooting a spectacular jump shot against an obese klutz made to look like Riley.