Complex sentence: Her elder daughter Sarah married a doctor, Owen Jones Wister, and they had one child, Owen Wister (b.1860), the popular American novelist and author of the 1902 western novel, "The Virginian".
Split into simpler sentences: Her elder daughter Sarah married a doctor, Owen Wister. Sarah and Owen had one child, Owen Wister Jr., the popular American novelist and author of the 1902 western novel, "The Virginian".