Complex sentence: Orozco attended the Escuela Nacional de Artes Plásticas between 1981 and 1984 but found it to be an overly conservative program of study and in 1986 he moved to Madrid and enrolled at the Circulo de Bellas Artes.
Split into simpler sentences: Orozco attended the Escuela Nacional de Artes Plásticas between 1981 and 1984. But Orozco found the Escuela Nacional de Artes Plásticas to be an overly conservative program of study and in 1986 he moved to Madrid and enrolled at the Circulo de Bellas Artes.