Complex sentence: In December 2002, he also released a solo album, "Been to the Future", which includes both original acoustic songs, and solo versions of tracks that appear on other albums by 3, such as "Paint by Number".
Split into simpler sentences: In December 2002 he released a solo album, "Been to the Future". It includes both original acoustic songs, and solo versions of tracks that appear on other albums by 3, such as "Paint by Number".