Complex sentence: The Sahara shut its doors on May 16,2011, and at 12:00 PM PDT, the last hotel guest checked out with doors officially closing at 2:00 PM.
Split into simpler sentences: The Sahara shut its doors on May 16,2011. On May 16,2011, at 12:00 PM PDT, the last hotel guest checked out of the Sahara Hotel and Casino, and the doors were officially closed at 2:00 PM.