Complex sentence: In December 2014, the band announced their fifth studio album, titled "Dear Tommy," that was preceded by a number of singles throughout the year, but as of 2017 has yet to be released.
Split into simpler sentences: In December 2014, the band announced their fifth studio album, titled "Dear Tommy". The album has been preceded by a number of its announced tracks being issued as singles but, as of the end of 2017, has yet to be released.