Complex sentence: On 20 June 1702, Adolphus Frederick II married secondly to Princess Johanna of Saxe-Gotha (1 October 1680--9 July 1704), a daughter of Frederick I, Duke of Saxe-Gotha-Altenburg, and Magdalena Sybille of Saxe-Weissenfels.
Split into simpler sentences: On 20 June 1702, Adolphus Frederick II married for a second time to Princess Johanna of Saxe-Gotha (1 October 1680--9 July 1704). Johanna was a daughter of Frederick I, Duke of Saxe-Gotha-Altenburg, and Magdalena Sybille of Saxe-Weissenfels.