Complex sentence: In 2005, The Savoy Group, including The Berkeley, was sold to Quinlan Private, which sold off the Savoy Hotel and Savoy Theatre and renamed the group Maybourne Hotel Group.
Split into simpler sentences: In 2005, The Savoy Group, including The Berkeley, was sold to Quinlan Private. The sale of The Savoy Group, led to the Savoy Hotel and Savoy Theatre being sold off and renamed as the Maybourne Hotel Group.