Complex sentence: Zack McKracken was originally released in October 1988, for C64, self-published by Lucasfilm Gamese, a port to IBM PC (MS-DOS) followed in the same year.
Split into simpler sentences: Zack McKracken was originally released in October 1988, for the C64, self-published by Lucasfilm Games. A port to IBM PC (MS-DOS) followed in the same year.