Complex sentence: Under Blackstone in 2006, Merlin went on to buy Gardaland, an Italian theme park, and then early in 2007 The Tussauds Group, owner of the Madame Tussauds celebrity wax attractions, for £1 billion.
Split into simpler sentences: Under Blackstone in 2006, Merlin went on to buy Gardaland, an Italian theme park. Early in 2007 they also purchased The Tussauds Group, owner of the Madame Tussauds celebrity wax attractions, for £1 billion.