Complex sentence: There are not many requirements in order to become a volunteer in the school system; whether one is a high school or TEFL (Teaching English as a Foreign Language) graduate or college student, most schools simply require voluntary and selfless effort.
Split into simpler sentences: There are not many requirements in order to become a volunteer in the school system. Whether one is a high school or TEFL (Teaching English as a Foreign Language) graduate or college student, most schools require just voluntary and selfless effort.