Complex sentence: It has already been released on Canadian radio stations, but it is unknown when the commercial single will be released nor if it will be released anywhere else but Canada, this is because of the rumoured third single Vegas.
Split into simpler sentences: It has already been released on Canadian radio stations, but it is uknown when the single will be released. It is uknown if it will be released anywhere else but Canada, this is because of the rumoured third single Vegas.