Complex sentence: The first documentation for the original 1984 Macintosh was available only in the form of photocopied sheets that could be obtained from Apple, it was not until 1985 that they were published in the form of a book that was available to the general public.
Split into simpler sentences: The first documentation for the original 1984 Macintosh was available only in the form of photocopied sheets that could be obtained from Apple. In 1985, they were published in the form of a book that was available to the general public.