Complex sentence: Before it became Tau Alpha Omega, its name was Free Student Society, when it was founded in the 1960s or Society of Students who Assert Freedom ("Scholasticus Adserto Sodalicium").
Split into simpler sentences: Before it became Tau Alpha Omega its name was Free Student Society. FSS was founded in the 1960s or Society of Students who Assert Freedom ("Scholasticus Adserto Sodalicium").