Complex sentence: In 1758 he married Ellen Yarnall, the daughter of Quaker preacher Mordecai Yarnall; the couple had five children (William, Mordecai, Sibyl, Catharine, Martha).
Split into simpler sentences: In 1758 he married Ellen Yarnall, the daughter of a Quaker preacher. The couple would have five children (William, Mordecai, Sibyl, Catharine, Martha).