Which option is a better choice?

1.) In that same year, the Academy was destroyed by Ulin Majere, Palin’s son, and the sorcerer Lucy Torkay in order to save its secrets from Beryllinthranox’s forces, who were preparing to attack the school.

2.) In that same year, the Academy was destroyed by Ulin Majere, Palin’s son, and the sorcerer Lucy Torkay in order to save its secrets from Beryllinthranox’s forces that were preparing to attack the school.