Complex sentence: On February 28th, the same day as the Wii release, an update for PC became available, allowing users to access a version of the game's "prototype", called "ROM City Rampage".
Split into simpler sentences: On February 28th, the same day as the Wii release, an update PC will became available. This update will let users access a version of the game's prototype, called "ROM City Rampage".