Complex sentence: The NHL has had a presence in Las Vegas since 1991, when an outdoor game was held in Las Vegas, with the Los Angeles Kings facing the New York Rangers outside Caesars Palace in a preseason exhibition game.
Split into simpler sentences: The NHL has had a presence in Las Vegas since 1991, when an outdoor game was held in Las Vegas. The Los Angeles Kings faced the New York Rangers outside Caesars Palace in a preseason exhibition game.