( ( Of ( ( the ( eight planets ) ) ( in ( the ( solar system ) ) ) ) ) ( , ( Mercury ( ( is ( ( the ( ( smallest and ) closest ) ) ( to ( the Sun ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Of) (NP (NP (DT the) (CD eight) (NNS planets)) (PP (IN in) (NP (DT the) (JJ solar) (NN system))))) (, ,) (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (JJS smallest) (CC and) (JJS closest)) (PP (TO to) (NP (DT the) (NNP Sun))))) (. .)))
Of the eight planets in the solar system, Mercury is the smallest and closest to the Sun.
(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))))))))))))) (. .)))