Complex sentence: The first of these groups were social-Christian University Students that took part in local campaigning for literacy who later joined the Social Christian Student Movements (MESC), who were members that branched off from the Democratic Christian parties (PDC).
Split into simpler sentences: The first of these groups were social-Christian University Students that took part in a local campaigning for literacy. They later joined the Social Christian Student Movements (MESC), who were members that branched off from the Democratic Christian parties (PDC).