Complex sentence: Otto von Kotzebue (December 30,1787-February 15,1846), Russian navigator, second son of August von Kotzebue, was born at Reval.
Split into simpler sentences: Otto von Kotzebue (December 30,1787-February 15,1846), was a Russian navigator. The second son of August von Kotzebue, he was born at Reval.