Complex sentence: In 2008, he uploaded videos on YouTube which included a Han Solo impression, had a very small extra part in James Cameron's "Avatar" as a technician and worked for Weta Workshop while he lived in New Zealand.
Split into simpler sentences: In 2008, he uploaded videos on YouTube which included a Han Solo impression. He also had a very small extra part in James Cameron's "Avatar" as a technician and worked for Weta Workshop while he lived in New Zealand.