( Mercury ( ( is ( one ( of ( ( the ( densest planets ) ) ( in ( the ( Solar System ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT the) (JJ densest) (NNS planets)) (PP (IN in) (NP (DT the) (NNP Solar) (NNP System))))))) (. .)))
Mercury is one of the densest planets in the Solar System.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (NP (PRP$ our) (JJ solar) (NN system)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB also)) (NP (NP (JJS nearest)) (PP (TO to) (NP (DT the) (NN sun))))))))))))) (. .)))