Complex sentence: On 9 February 1747, Maria Josepha married Louis, Dauphin of France, whose first wife, Infanta Maria Teresa Rafaela of Spain, had died on 22 July 1746 after giving birth to a daughter, the couple's only child.
Split into simpler sentences: On 9 February 1747, Maria Josepha married Louis, Dauphin of France. His first wife, Infanta Maria Teresa Rafaela of Spain, had died on 22 July 1746 after giving birth to a daughter, the couple's only child.