Complex sentence: The technology is still in its infancy and the use is directly dependent on someones knowledge of engineering to design a part and effectively use the printing equipment thus; the growth of the market is, although fast at 33% annually or better according to Terry Wohlers.
Split into simpler sentences: The technology is still new and its use is directly dependent on users' knowledge of engineering to design a part and effectively use the printing equipment. The growth of the market is nevertheless fast, at 33% annually or better according to Terry Wohlers.