Complex sentence: Half a million bucks!!! The event that the "Butterfly Trek Madone" was being presented at was the "It's About the Bike" auction held on 1 November 2009 in New York City.
Split into simpler sentences: Half a million bucks!!! The auction that the Butterfly Trek Madone was being auctioned off at was the "It's About the Bike" auction. This auction was held on 1 November 2009 in New York City.