Complex sentence: The M1928 was installed in some biplane fighters of the late 1920s and early 1930s, but proven unreliable; sometimes the case was fractured and parts remains left in the chamber and difficult to synchronize, so it was replaced by the better Breda SAFAT designs.
Split into simpler sentences: The M1928 was installed in some biplane fighters of the late 1920s and early 1930s. It was proven unreliable as sometimes the case ruptured with remains left in the chamber and difficult to synchronize, so it was replaced by the better Breda SAFAT designs.