Complex sentence: Noticed by France's Ambassador to Russia, Mr de Ségur, he was entrusted to carry important news to Versailles where he met with Paul Antoine Fleuriot de Langle, second in command of the La Pérouse expedition, who had the respect of Louis XVI.
Split into simpler sentences: Noticed by France's Ambassador to Russia, Mr de Ségur, he was entrusted to carry important news to Versailles. There he met with Paul Antoine Fleuriot de Langle, second in command of the La Pérouse expedition, who had the respect of Louis XVI.