Complex sentence: On March 23,2013, the cinematographic studios in Rome hosted the Italian launch of "League of Legends"; more than 1,500 people were present, along with Riot Games developers, journalists and various guests.
Split into simpler sentences: On March 23,2013, the cinematographic studios in Rome hosted the Italian launch of "League of Legends". More than 1,500 people were present, along with Riot Games developers, journalists and various guests.