Complex sentence: In January 2007, Harley and the band entered the recording studio and Harley soon announced plans for a new studio album, which he hoped to have completed by autumn 2007 for a release in spring 2008.
Split into simpler sentences: In January 2007, Harley and the band went into the recording studio to record new material. Around this time, Harley announced plans for a new studio album, which he hoped to have completed by autumn 2007 for a release in spring 2008.