Complex sentence: In 1955, at the age of 36, he won first prize at the Third Hispano-American Biennial of Art in Barcelona, for "El ataúd blanco" and in 1957 he was named the best South American painter at the Fourth Biennial of São Paulo.
Split into simpler sentences: In 1955, at the age of 36, won first prize at the Third Hispano-American Biennial of Art in Barcelona, for "El ataúd blanco". In 1957 he was named the best South American painter at the Fourth Biennial of São Paulo.