Complex sentence: The song was released as a single on iTunes in Norway on 2 September 2013, and was planned to be released on iTunes in the United States on September 9, but remained unavailable for one week due to allegations of copyright infringement by a third party.
Split into simpler sentences: The song was released as a single on iTunes in Norway on 2 September 2013, and it was planned to be released on iTunes in the United States on September 9. However, it remained unavailable for one week due to allegations of copyright infringement by a third party.