Complex sentence: Louis Albert Necker, (April 10 1786--November 20 1861), was a Swiss crystallographer, best remembered for devising the optical illusion now known as the Necker cube.
Split into simpler sentences: Louis Albert Necker, (April 10 1786--November 20 1861), was a Swiss crystallographer. He is best remembered for devising the optical illusion now known as the Necker cube.