Complex sentence: In 1929, along with Carlo and Nello Rosselli he founded a communist movement called "Giustizia e Libertà", becoming a director of the Italian branch along with Leone Ginzburg, a Russian Jew from Odessa who had emigrated with his parents to Italy.
Split into simpler sentences: In 1929, along with Carlo and Nello Rosselli he founded a Communist movement called "Giustizia e Libertà". He was a director of the Italian branch along with Leone Ginzburg, a Russian Jew from Odessa who immigrated with his parents to Italy.