Complex sentence: She is 16 years old and the first princess of the Misurugi Empire, she was designated to be the next in line to inherit the throne, but unbeknownst to her she is a Norma who grew up believing that she could use Mana.
Split into simpler sentences: She is 16 years old and the first princess of the Misurugi Empire. Before the events of the series, she is designated to be the next in line to inherit the throne, but she is a Norma who grows up believing that she could use Mana.