Complex sentence: Although he comes very early in the history of engraving for prints, the Master of the Playing Cards is certainly not the inventor of the technique, but he is the first significant artist to use either printmaking technique.
Split into simpler sentences: Although he comes very early in the history of engraving for prints, the Master of the Playing Cards is certainly not the inventor of the technique. He is however considered the first significant artist to use either printmaking technique.