Complex sentence: After Giuseppe Mario Bellanca, the designer and builder of Italy's first aircraft, came to the United States in 1911, he began to design aircraft for a number of firms, including the Maryland Pressed Steel Company, Wright Aeronautical Corporation and the Columbia Aircraft Corporation.
Split into simpler sentences: After Giuseppe Mario Bellanca, the designer and builder of Italy's first aircraft, came to the United States in 1911. He began to design aircraft for a number of firms, including the Maryland Pressed Steel Company, Wright Aeronautical Corporation and the Columbia Aircraft Corporation.