Complex sentence: Changmarín returned to formal education at the Juan Demostenes Arosemena Normal School (founded in 1938) and mentored by intellectuals from South America and Europe, most of whom were victims of the rampant European fascism, which helped to consecrate and refine his ideals.
Split into simpler sentences: Changmarín returned to formal education at the Juan Demostenes Arosemena Normal School (founded in 1938). He was mentored by intellectuals from South America and Europe, most of whom were victims of European fascism, which helped to consecrate and refine his ideals.