Complex sentence: Many mixologists believe the Bloody Mary made its first U.S. appearance in the King Cole Bar, then called "The Red Snapper," after originally being invented by Fernand Petiot at Harry's New York Bar in Paris, France.
Split into simpler sentences: Many mixologists believe the Bloody Mary made its first U.S. appearance in the King Cole Bar. The drink was then called "The Red Snapper," after originally being invented by Fernand Petiot at Harry's New York Bar in Paris, France.