Complex sentence: He was recaptured in September of 1944 in Milan, imprisoned at Villa Triste, tortured, and transferred to the prison of San Vittore, then to Bolzano and then to Mauthausen, Melk and back to Mauthausen.
Split into simpler sentences: He was recaptured in September of 1944 in Milan, imprisoned at Villa Triste, tortured. Later he was transferred to the prison of San Vittore, then to Bolzano and then to Mauthausen, Melk and back agian to Mauthausen.