Complex sentence: While a low-quality version leaked on December 31,2014, a full version of the record remains unreleased digitally and was omitted from the film's official soundtrack and Stefani's third studio album "This Is What the Truth Feels Like" (2016).
Split into simpler sentences: While a low-quality version leaked on December 31,2014, a full version of the record remains unreleased digitally. It was omitted from the film's official soundtrack, and was not included on Stefani's third studio album "This Is What the Truth Feels Like" (2016).