Complex sentence: After being introduced to the ideas of Proudhon by José de Jesus Márquez, Saturnino Martínez (an immigrant to Cuba from Asturias) founded "La Aurora" in 1865, a periodical directed at tobacco workers, which included the earliest advocation of cooperative societies in Cuba.
Split into simpler sentences: After being introduced to the ideas of Pierre-Joseph Proudhon by José de Jesus Márquez, Saturnino Martínez (an Asturian immigrant to Cuba) founded the periodical "La Aurora" in 1865. Directed at tobacco workers, it included the earliest advocation of cooperative societies in Cuba.