Complex sentence: However, the parents of the students come to Mr. Shoop's defense, and because of the students' large improvement, Principal Kelban (Francis X. McCarthy) grants Mr. Shoop tenure for his positive effect.
Split into simpler sentences: However, the parents of the students come to Shoop's defense. Because of the students' great improvement, Principal Kelban (Francis X. McCarthy) grants Shoop tenure for his positive effect.