Complex sentence: McCain enrolled at North Carolina Agricultural and Technical State University (A&T) during the Fall 1959 semester, just months before joining three other freshman to stage the Greensboro Four sit-in at Woolworth's in February 1960.
Split into simpler sentences: McCain enrolled at North Carolina Agricultural and Technical State University in the Fall of 1959. It was during his freshmen year that he just months before joining three other freshman to stage the Greensboro Four sit-in at Woolworth's in February 1960.