Complex sentence: During lunch the next day, the other students, now including Jane, mock the villain kids; a hurt Mal undoes Jane's hair reversing it back to normal, threatening to do the same to the other girls.
Split into simpler sentences: During lunch the next day, the other students, now including Jane, mock the villain kids. A hurt Mal undoes Jane's hair reversing it back to normal, threatening to do the same to the other girls.