( Mercury ( ( is ( ( ( ( the ( smallest planet ) ) ( in ( our ( Solar system ) ) ) ) and ) ( also ( ( the ( closest one ) ) ( to ( the Sun ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (UCP (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (PRP$ our) (NNP Solar) (NN system)))) (CC and) (RRC (ADVP (RB also)) (NP (NP (DT the) (JJS closest) (NN one)) (PP (TO to) (NP (DT the) (NNP Sun))))))) (. .)))
Mercury is the smallest planet in our Solar system and also the closest one to the Sun.
(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))))) (. .)))