Complex sentence: The Fate of the World's Greatest Lost Treasure, concluded that the Amber Room was most likely destroyed when Königsberg Castle was burned down, shortly after Königsberg surrendered to occupying Soviet forces.
Split into simpler sentences: The Fate of the World's Greatest Lost Treasure. In it, they concluded that the Amber Room was most likely destroyed when Königsberg Castle was burned down, shortly after Königsberg surrendered to occupying Soviet forces.