Complex sentence: In July 31st, the group announced that they will be performing their new single in Durham, and at that gig the band confirmed that Heavenli decided to quit the band for the third time continuing the band as duo.
Split into simpler sentences: In July 31st, the group announced that they will be performing their new single in Durham. At that same gig, the band confirmed that Heavenli decided to quit the band for the third time, therefore continuing the band as duo.