Complex sentence: Lucien Bonaparte (1775--1840) married twice: first to Christine Boyer, who gave birth to a stillborn son and three daughters; and second to Alexandrine de Bleschamp and had eight children.
Split into simpler sentences: Lucien Bonaparte (1775--1840) married twice firstly to Christine Boyer they had stillborn son and three daughters. He married secondly to Alexandrine de Bleschamp and had eight children.