Complex sentence: In 2000, the ULEB decided to break from FIBA and begin the new Euroleague in 2001, featuring a five-game series (instead of the one-game final), but that was dropped after one year.
Split into simpler sentences: In 2000, the ULEB decided to break from FIBA and begin the new Euroleague with the Euroleague 2000-01 season. That first season of the Euroleague featured a five-game series final (instead of the traditional one-game final), but that was dropped after one year.