( ( ( ( Mercury , ) ( our ( innermost planet ) ) ) , ) ( ( orbits ( very ( close ( to ( the Sun ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Mercury)) (, ,) (NP (PRP$ our) (JJ innermost) (NN planet)) (, ,)) (VP (VBZ orbits) (ADJP (RB very) (JJ close) (PP (TO to) (NP (DT the) (NNP Sun))))) (. .)))
Mercury, our innermost planet, orbits very close to the Sun.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (ADJP (ADJP (JJS closest)) (PP (TO to) (NP (DT the) (NN sun))))) (. .)))