Complex sentence: The most notorious story featured the impressive feat of convincing a German U-boat to surrender by broadcasting a made up congratulatory message to the captain, stating that his wife had given birth to twins, when he had not been on leave for more than two years.
Split into simpler sentences: The most notorious story featured the impressive feat of convincing a German U-boat to surrender by broadcasting a made up congratulatory message to the captain. Stating his wife had given birth to twins, he of course had not been on leave for more than two years.