Complex sentence: After further voyages, this time to the East Indies, Wessel was appointed Second Lieutenant in the Royal Danish-Norwegian Navy on July 7,1711, and went on to serve on the frigate "Postillion".
Split into simpler sentences: After further voyages, this time to the East Indies, Wessel was, on the July 7,1711. He was appointed Second Lieutenant in the Royal Danish-Norwegian Navy and served on the frigate "Postillion".