Complex sentence: The literary life attracted Papini, who founded the magazine "Il Leonardo", together with Giuseppe Prezzolini, in 1903, then joined Enrico Corradini's group as co-editor of "Il Regno".
Split into simpler sentences: The literary life attracted Papini, who in 1903 founded the magazine "Il Leonardo", together with Giuseppe Prezzolini. He would later join Enrico Corradini's group as co-editor of "Il Regno".