Complex sentence: The Cavern Club was the third club managed by Alan Synter, which originally opened as a jazz-only club on 16 January 1957, styling the club after the Paris venue, Le Caveau.
Split into simpler sentences: The Cavern Club was the third club managed by Alan Synter, which originally opened as a jazz-only club on 16 January 1957. He styled the club after the Paris venue, Le Caveau.