Complex sentence: In March 2013, Carlisle released her first U.S. single in 17 years entitled "Sun", an uptempo pop song, which was included on "ICON", a new greatest hits compilation album.
Split into simpler sentences: In March 2013, Carlisle released her first U.S. single in 17 years, titled "Sun". An uptempo pop song, it was included on "Icon", a new greatest hits compilation album.