Complex sentence: Blake had previously produced albums by Tom Waits and Crowded House and pick of the dozens of tracks produced during the 18 month in the studio became their fourth album "Split the Difference" released in May 2004.
Split into simpler sentences: Blake had previously produced albums by Tom Waits and Crowded House. The pick of the dozens of tracks produced during the 18 months in the studio became their fourth album "Split the Difference" released in May 2004.