Complex sentence: She studied voice with Rosa Papier and Johannes Ress at the Vienna Conservatory, and then privately with Cosima Wagner and Mahler, having an affair with the latter which lasted until 1897.
Split into simpler sentences: She studied voice with Rosa Papier and Johannes Ress at the Vienna Conservatory, and then privately with Cosima Wagner and Mahler. She had an affair with the latter which lasted until 1897.