Complex sentence: Ceferino wrote to his father that he was not happy in that place and Manuel asked advance to his also friend, the former Argentinian president Luís Sánchez Peña who recommended to Coronel Manuel Namuncurá to send the boy to the Salesians of Don Bosco.
Split into simpler sentences: Ceferino wrote to his father that he was not happy in that place and Manuel then asked former Argentine president Luís Sánchez Peña's advise. He recommended to Coronel Manuel Namuncurá that he send the boy to the Salesians of Don Bosco.