Complex sentence: In May 2008, Cameron Boyce made his television debut on the Panic! at the Disco music video, "That Green Gentleman (Things Have Changed)", appearing as a kid version of the guitarist Ryan Ross.
Split into simpler sentences: In May 2008, Cameron Boyce made his television debut on the Panic! At The Disco music video, "That Green Gentleman (Things Have Changed)", appearing as a kid version of the guitarist Ryan Ross.