Complex sentence: In 2010, it filled the San Diego Convention Center to capacity with more than 130,000 attendees which makes it the fourth comic convention in the world for number of attendees, after Comiket, Angoulême International Comics Festival and Lucca Comics and Games.
Split into simpler sentences: In 2010, it filled the San Diego Convention Center to capacity with more than 130,000 attendees. Actually that makes it the fourth comic convention in the world for number of attendees, after Comiket, Angoulême International Comics Festival and Lucca Comics and Games.