Complex sentence: Designers and artists from Puerto Rico, Dominican Republic, France, and Spain all contributed to the hotel's overall construction and when it opened on October 10,1942 it became an instant sensation among the island's social elite.
Split into simpler sentences: Designers and artists from Puerto Rico, Dominican Republic, France, and Spain all contributed to the hotel's overall construction. When it opened on October 10,1942, it became an instant sensation among the island's social elite.