Complex sentence: On August 10,2013, Bird and Lindelof gave a presentation at the D23 Expo in Anaheim, California, where they opened the "1952" box and revealed many of its contents.
Split into simpler sentences: On August 10,2013, Bird and Lindelof gave a presentation at the D23 Expo in Anaheim, California. They opened the "1952" box and revealed many of its contents.