Complex sentence: Her hairstyle is the reason why she is referred to as "Drill" by Akiharu (which upsets her) and in the anime, her spins and make sounds similar to a drill whenever she is upset.
Split into simpler sentences: Her hairstyle is the reason why Akiharu refers to her as "Drill" (which upsets her). In the anime, her hair spins and make sounds similar to a drill whenever she is upset.