Complex sentence: During the mid 1950's he conducted "Die Meistersinger von Nürnberg" and other Wagner operas at the annual Bayreuth Festival, an extraordinary honor for a conductor who didn't come from Germany or Austria.
Split into simpler sentences: During the mid 1950's he began conducting at the annual Bayreuth Festival, leading "Die Meistersinger von Nürnberg" and other works. This was an extraordinary honor at the time for a conductor who didn't come from Germany or Austria.