Complex sentence: Allen confirmed during an interview to the BBC at Glastonbury she recorded the music video for another album track and a future single, and after confirming it is would track "As Long as I Got You".
Split into simpler sentences: Allen confirmed during an interview to the BBC at Glastonbury that she recorded a music video for another album track and a music video for a future single. She later confirmed it would serve for the track "As Long as I Got You".