( ( ( Place ( the ( double ( concave lens ) ) ) ) ( after ( the ( cylindrical lens ) ) ) ) . )
(ROOT (S (VP (VB Place) (NP (DT the) (JJ double) (NN concave) (NN lens)) (PP (IN after) (NP (DT the) (JJ cylindrical) (NN lens)))) (. .)))
Place the double concave lens after the cylindrical lens.
(ROOT (S (NP (JJ Concave) (NNS lenses)) (VP (MD can) (VP (VB correct) (NP (NN myopia)))) (. .)))