Complex sentence: The show follows fairy princess Astral, who has to choose between staying in her role and becoming a human attending high school as she is set to inherit the crown of her royal kingdom of Athenia.
Split into simpler sentences: The show follows fairy princess Astral, who gets a chance to be part of the human world, attending high school. However, she has to choose between being a fairy princess or a human as she is set to inherit the crown of her royal kingdom of Athenia.