Complex sentence: The 250 MM's race debut was at the 1953 Giro di Sicilia with privateer Paulo Marzotto, and a Carrozzeria Morelli-bodied 250 MM barchetta driven by Clemente Biondetti came fourth in the 1954 Mille Miglia.
Split into simpler sentences: The 250 MM's race debut was at the 1953 Giro di Sicilia with privateer Paulo Marzotto. A Carrozzeria Morelli-bodied 250 MM barchetta driven by Clemente Biondetti came fourth in the 1954 Mille Miglia.