Complex sentence: The ship's radio officer, David Broadfoot, was posthumously awarded the George Cross for staying at his post to the very end, allowing passengers and crew to escape, even though by doing so he was preventing his own escape.
Split into simpler sentences: The ship's radio officer, David Broadfoot, was posthumously awarded the George Cross. For staying at his post to the very end, allowing passengers and crew to escape, even though he knew that by doing so he was preventing his own escape.