( ( ( ( Mercury , ) ( ( the ( smallest planet ) ) ( in ( the ( Solar System ) ) ) ) ) , ) ( ( has ( the ( ( most eccentric ) orbit ) ) ) . ) )
(ROOT (S (NP (NP (NNP Mercury)) (, ,) (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (DT the) (NNP Solar) (NNP System)))) (, ,)) (VP (VBZ has) (NP (DT the) (ADJP (RBS most) (JJ eccentric)) (NN orbit))) (. .)))
Mercury, the smallest planet in the Solar System, has the most eccentric orbit.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))