Complex sentence: However, unlike most other external DOS commands, it has not been transformed into a native Win32 program and it does not support long filenames which were only added to MS-DOS and MS-Windows long after Edlin was written.
Split into simpler sentences: However, unlike most other external DOS commands, it has not been transformed into a native Win32 program. It also does not support long filenames, which were only added to MS-DOS and MS-Windows long after Edlin was written.