Complex sentence: Princess Hayu, spent a year attending junior high school in Brisbane, Australia, until she decided to return back to Indonesia, where she continued her high school at SMAN 3 Padmanaba Yogyakarta a high school that was also attended by her future husband Prince Notonegoro.
Split into simpler sentences: Princess Hayu, attended junior high school in Australia for a year before she decided to return back to Indonesia. She has then continued her study at SMAN 3 Padmanaba Highschool Yogyakarta, a high school that was also attended by her husband Prince Notonegoro.