Complex sentence: She married into the eminent international banking and finance known as the House of Mendes, and was the aunt and business partner of Joseph Nasi, who became a prominent figure in the politics of the Ottoman Empire.
Split into simpler sentences: She married into the eminent international banking and finance company known as the House of Mendes. She was the aunt and business partner of Joseph Nasi, who became a prominent figure in the politics of the Ottoman Empire.