Complex sentence: Her sister, who was called Nora, was married in 1876 to Zionist politician Arnold Kerdijk (1846-1907), the founder of the Free-thinking Democratic League and from 1887 to 1901 a Member of the House of Representatives of the Netherlands.
Split into simpler sentences: Her sister, who was called Nora, was married Zionist politician Arnold Kerdijk (1846-1907) in 1876, the founder of the Free-thinking Democratic League. From 1887 to 1901 he was a Member of the House of Representatives of the Netherlands.