Complex sentence: "The truth about Orpheus" is the most expensive documentary made at the period after 1989 movie was filmed in 14 countries in which the director captures the museum artifacts and archaeological sites associated with Orpheus and Orphism.
Split into simpler sentences: The truth about Orpheus is the most expensive documentary movie made after 1989. The movie was filmed in 14 countries in which the director captures the museum artifacts and archaeological excavations associated with Orpheus and Orphism.