Complex sentence: She takes her duties as a Magical Girl very seriously and is initially dismissive of Illya's abilities, but gradually warms up to Illya, begins to develop feelings for her and is highly protective of her.
Split into simpler sentences: She takes her duties as a Magical Girl very seriously and is initially dismissive of Illya's abilities, but gradually warms up to Illya. She later begins to develop feelings for her and is highly protective of her.