Complex sentence: On June 30, Imogen put a Sparks vBlog on YouTube, unveiling that the album will be released on 18 August 2014 but it won't be released under RCA but under her own label, Megaphonic.
Split into simpler sentences: On June 30, Imogen put a Sparks vBlog on YouTube, confirming that the album will be released on 18 August 2014. However, it won't be released under RCA but under her own label, Megaphonic.