Complex sentence: One of her sisters married king Andrew II of Hungary, while another was abbess at the Benedictine convent of Lutzingen in Franconia, where Hedwig received her education.
Split into simpler sentences: One of her sisters married king Andrew II of Hungary. Another of Hedwig's sisters was abbess at the Benedictine convent of Lutzingen in Franconia, where Hedwig received her education.