Complex sentence: In spring 2011, its membership included seven MIT students and one Harvard student; in summer 2011, it was listed by MIT as a derecognized group and began operating as a Section 5 unaffiliated student organization.
Split into simpler sentences: In spring 2011, its membership included seven MIT students and one Harvard student. In summer 2011, it was listed by MIT as a derecognized group and began operating as a Section 5 unaffiliated student organization.