Complex sentence: His feet are positioned as if he is stepping forward, almost about to move out of the canvas and he looks directly at the viewer, giving the illusion of judging not only the souls in the painting but the worshippers gazing at him.
Split into simpler sentences: His feet are positioned as if he is stepping forward, almost about to move out of the canvas, as he looks directly at the viewer. He steps towards the viewer, giving the illusion of judging not only the souls in the painting but the worshippers gazing at him.