Complex sentence: Captain Forstmann subsequently detained the lifeboat with the captain of the Orteric long enough to force the latter to sign a German document, then set him adrift, and a few hours later three lifeboats with the survivors of the Orteric were rescued by a British hospital ship.
Split into simpler sentences: Captain Forstmann subsequently detained the lifeboat with the captain of the Orteric long enough to force the latter to sign a German document, then set him adrift. A few hours later three lifeboats with the survivors of the Orteric were rescued by a British hospital ship.