Complex sentence: The band played a few surprise shows in early 2000 to try to gain a label's attention but they were unsuccessful and in 2000 after a concert to celebrate the opening of Seattle's Experience Music Project, the band surprisingly announced their official breakup.
Split into simpler sentences: The band played a few surprise shows in early 2000 to try to gain a label's attention but they were unsuccessful. In 2000 after a concert to celebrate the opening of Seattle's Experience Music Project, the band surprisingly announced their official breakup.