Complex sentence: In 1977,47 cases of hemifacial spasm all decompressed using the operating microscope, and illustrated nerve-vessel conflicts (or cholesteatoma in one case) to be located at the root exit zone of the facial nerve in all cases.
Split into simpler sentences: In 1977,47 cases of hemifacial spasm underwent decompression of the nerve using the operating microscope. The results illustrated nerve-vessel conflicts (or cholesteatoma in one case) to be located at the root exit zone of the facial nerve in all cases.