Complex sentence: The looted Borobudur Buddha's heads were mostly sold abroad, ending up in private collections or acquired by Western museums such as the Tropenmuseum in Amsterdam and The British Museum in London.
Split into simpler sentences: The looted Borobudur Buddha's head mostly were sold abroad, ended as private collection or acquired by Western museums. Some of these Buddha heads are now displayed in numbers of museums, such as the Tropenmuseum in Amsterdam and The British Museum in London.