Complex sentence: The NBA Summer League is currently held in Paradise, Nevada, with the 2008 and 2012 United States men's Olympic basketball teams trained in Las Vegas and played a game at the Thomas & Mack Center against the Dominican Republic.
Split into simpler sentences: The NBA Summer League is currently held in Paradise, Nevada. The 2008 and 2012 United States men's Olympic basketball teams trained in Las Vegas, and played a game at the Thomas & Mack Center against the Dominican Republic.