Complex sentence: A file name may be up to 16 bytes in length and theoretically will be unique; by using direct access methods on the directory structure, it is possible to to rename a file to that of another--although accessing such files may be difficult or impossible.
Split into simpler sentences: A file name may be up to 16 bytes in length and theoretically will be unique. However, by using direct access methods on the directory structure, it is possible to to rename a file to that of another--although accessing such files may be difficult or impossible.