Complex sentence: On March 6,2013 the owner, Hotel Blackhawk, LLC, entered the property into the Marriott Autograph Collection of luxury hotels, a group of independently owned and operated hotels associated with Marriott Hotels and Resorts.
Split into simpler sentences: On March 6,2013 the hotel became a property in the Marriott Autograph Collection of luxury hotels. The Autograph Collection are independently owned and operated hotels associated with Marriott Hotels and Resorts.