Complex sentence: The workers that had worked on the project were mostly from the Province of Entre Ríos, and in 1901, they successfully petitioned for the neighborhood to be named after their provincial hero, Justo José de Urquiza.
Split into simpler sentences: The workers that had worked on the project were mostly from the province of Entre Ríos. And subsequently, they asked for the neighborhood to be named after their provincial hero, Justo José de Urquiza.