Complex sentence: He has received 12 awards in Barcelona, Belgrade, Berlin, Brussels and Las Vegas, the most prestigious of which were the AVN Awards as "Male Foreign Performer of the Year" in Las Vegas in 2005 and 2006.
Split into simpler sentences: He has received 12 awards in Barcelona, Belgrade, Berlin, Brussels and Las Vegas. The most important for him was the AVN Award as "Male Foreign Performer of the Year" in Las Vegas 2005 and 2006.