Complex sentence: On 5 October 1722, Charles married Maria Amalia, Archduchess of Austria as the daughter of Joseph I, Holy Roman Emperor and his wife Princess Wilhelmina Amalia of Brunswick-Lüneburg.
Split into simpler sentences: On 5 October 1722, Charles married Maria Amalia, Archduchess of Austria. Marie Amalia was a daughter of Joseph I, Holy Roman Emperor and his wife Princess Wilhelmina Amalia of Brunswick-Lüneburg.