Complex sentence: He was called to Los Angeles for an audition at San Diego Comic Con 2011 in a "Face Off" Challenge where he competed for the final spot on the show with two other would be contestants.
Split into simpler sentences: He was called to Los Angeles for an audition. From there, he was part of the San Diego Comic Con 2011 "Face Off" Challenge where he competed for the final spot on the show with two other would be contestants.