Complex sentence: News from Midway's sequel to "Ready 2 Rumble Boxing" were first made public back in early summer of 1999 and in May 2000, showed of the game at that year's E3 for demonstration.
Split into simpler sentences: News from Midway's sequel to "Ready 2 Rumble Boxing" were first made public back in early summer of 1999. In May 2000, showed of the game at that year's E3 for demonstration.