Complex sentence: Mario Castoldi, designer of the 1926 winner, the Macchi M.39, also designed other contestants such as the M.52, the M.52R, the M.67, and the M.C.72.
Split into simpler sentences: Mario Castoldi, designer of the 1926 winner, the Macchi M.39. Also designed other contestants such as the M.52, the M.52R, the M.67, and the M.C.72.