Complex sentence: In an interview with "Billboard", Desiigner confirmed the release of his upcoming mixtape, titled "Trap History Month", which was renamed and released as "New English" for the June 2016 release.
Split into simpler sentences: In an interview with "Billboard", Desiigner confirmed the release of his upcoming mixtape, titled "Trap History Month". It was announced that the mixtape has been renamed as "New English", and slated for the June 2016 release.