Complex sentence: He was a fellow of the Mexican Center of Writers (1953-1954 and 1962-1963), professor at the UNAM (1969 -), at the National Theatre School Institute of Fine Arts (1960--82) and the Center for Experimental Theatre.
Split into simpler sentences: He was a fellow of the Mexican Center of Writers (1953-1954 and 1962-1963). Professor at the UNAM (1969 -) of the National Theatre School Institute of Fine Arts (1960--82) and the Center for Experimental Theatre.