Complex sentence: On April 24,2014, the band appeared on Ryan Seacrest's popular KIIS-FM radio show, On Air with Ryan Seacrest, where it was announced that the band would be the opening act at the Wango Tango Music Festival.
Split into simpler sentences: On April 24,2014, the band appeared on Ryan Seacrest's popular KIIS-FM radio show, On Air with Ryan Seacrest. Here, it was announced that they would be the opening act at the Wango Tango music festival.