Complex sentence: One version of such a "generic MS-DOS" (Z-DOS) is mentioned here, but there were dozens more, all for personal computers that used a 8086-family microprocessor, but which were not IBM PC compatible.
Split into simpler sentences: One version of such a "generic MS-DOS" (Z-DOS) is mentioned here, but there were dozens more. All these were for personal computers that used a 8086-family microprocessor, but which were not IBM PC compatible.