Complex sentence: The release of the band's final studio album, "Old Ramon" (2001), was delayed for three years, with Kozelek subsequently embarking upon a solo career, recording an album and an EP of AC/DC cover songs.
Split into simpler sentences: The release of the band's final studio album, "Old Ramon" (2001), was delayed for three years. In the interim, Kozelek recorded both an album and an EP of AC/DC cover songs.