Complex sentence: In 2008, Stella choreographed aerial stunts for an interactive video for "Cher at the Colosseum," appearing in it at Caesar's Palace in Las Vegas with the star's "Laverne" character.
Split into simpler sentences: In 2008, Stella choreographed aerial stunts for an interactive video for "Cher at the Colosseum," staged at Caesar's Palace in Las Vegas. He appeared in the video with the star's "Laverne" character.