Complex sentence: Initially the book was planned to be 150 pages on sous vide, in late 2009 is was planned to 1,500 pages but eventually it was pressed at 2,438 pages.
Split into simpler sentences: Initially the book was planned to be 150 pages on sous vide. In late 2009 it was planned to 1,500 pages, but eventually it was pressed at 2,438 pages.