Complex sentence: Chantel Kohl sang it in the live shows, they made it their 3rd music video when Chauncey got voted into the group, and when all 5 were in they released it as a single from their album.
Split into simpler sentences: Chantel Kohl sang it in the live shows, and the group made it their third music video when Chauncey got voted into the group. When all five members were selected, they released it as a single from their album.