Complex sentence: Later that year, the third numbered entry,', was released for the PlayStation 2, this was the first prequel which was set before all the previously released Metal Gear games and acted as an origin to the franchise.
Split into simpler sentences: Later that year, the third numbered entry,', was released for the PlayStation 2. This is the first prequel which was set prior to all the previously released Metal Gear games and which acted as an origin to the franchise.