Complex sentence: Lieberman is encouraged by an American Nazi-hunter to expose the scheme and turn over a list identifying the names and whereabouts of the other "boys from Brazil" from around the world, so that they can be systematically killed before growing up.
Split into simpler sentences: Lieberman is encouraged by an American Nazi-hunter to expose the scheme. He is asked to turn over a list identifying the names and whereabouts of the other "boys from Brazil" from around the world, so that they can be systematically killed before growing up.