Complex sentence: The child who was to be Henry V of England was born at Monmouth Castle on 16 September 1386, he was the son of Mary de Bohun and Henry Bolingbroke, and the grandson of John of Gaunt.
Split into simpler sentences: The child who was to be Henry V of England was born at Monmouth Castle on 16 September 1386. He was the son of Mary de Bohun and Henry Bolingbroke, and the grandson of John of Gaunt.