Complex sentence: Following the three voyages of James Cook French King Louis XVI had commanded a similar expedition be sent out by France and this comprised the frigates Le Boussole, the flagship with Collignon in the crew, and L’Astrolabe under the command of Fleuriot de Langle.
Split into simpler sentences: Following the three voyages of James Cook, French King Louis XVI had commanded a similar expedition be sent out by France. The La Pérouse expedition was comprised of the frigates La Boussole, the flagship with Collignon in the crew, and L’Astrolabe under the command of Fleuriot de Langle.