Complex sentence: In November 2013, the song leaked on the internet, with people pretending it as a demo from the final track, however, with the release of the album, it was later revealed that it was the final version of the song.
Split into simpler sentences: In November 2013, the song leaked on the internet, and it was believed to be a demo of the final track. However, with the release of the album, it was later revealed that the leak was the final version of the song.