Complex sentence: The game was re-written for the Windows platform in the early 21st century, however the new version was a failure-the new graphical interface detracted from the intense gameplay that made Reach for the Stars a gaming classic.
Split into simpler sentences: The game was re-written for the Windows platform in the early 21st century. However, the new version was a failure, as the new graphical interface detracted from the intense gameplay that made "Reach for the Stars", a gaming classic.