Complex sentence: Duchess Anna of Prussia and Jülich-Cleves-Berg (3 July 1576--30 August 1625) was the daughter of Albert Frederick, Duke of Prussia and Marie Eleonore of Cleves and became the spouse of John Sigismund, Elector of Brandenburg.
Split into simpler sentences: Duchess Anna of Prussia and Jülich-Cleves-Berg (3 July 1576--30 August 1625) was the daughter of Albert Frederick, Duke of Prussia, and Marie Eleonore of Cleves. She became the spouse of John Sigismund, Elector of Brandenburg.