Complex sentence: In 2000, Shinya Hashimoto proposed an independent promotion within New Japan Pro Wrestling called New Japan Pro Wrestling ZERO; the idea was shot down, and when Hashimoto was fired by NJPW in November 2000, he registered the Pro Wrestling ZERO-ONE name.
Split into simpler sentences: In 2000, Hashimoto proposed an independent promotion within NJPW called New Japan Pro Wrestling ZERO, but the idea was shot down. When Hashimoto was fired by NJPW in November 2000, he registered the Pro Wrestling ZERO-ONE name.