Complex sentence: After World War II, it was taught that the story was only a legend with no real historical value, despite the Roman historical accounts, until a discovery by a novice treasure hunter proved the story of'Hermann' to be real.
Split into simpler sentences: After World War II, it was taught that the story was only a legend with no real historical value, despite the Roman historical accounts. Until a discovery by a novice treasure hunter proved the story of Hermann to be real.