( ( Like ( ( the ( other ( large planets ) ) ) ( of ( the ( outer ( solar system ) ) ) ) ) ) ( ( ( ( Jupiter ( , ( Saturn , ) ) ) and ) ( Neptune Uranus ) ) ( ( is ( believed ( to ( be ( mostly ( composed ( of gas ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN Like) (NP (NP (DT the) (JJ other) (JJ large) (NNS planets)) (PP (IN of) (NP (DT the) (JJ outer) (JJ solar) (NN system))))) (NP (NP (NNP Jupiter) (, ,) (NNP Saturn) (, ,)) (CC and) (NP (NNP Neptune) (NNP Uranus))) (VP (VBZ is) (VP (VBN believed) (S (VP (TO to) (VP (VB be) (VP (ADVP (RB mostly)) (VBN composed) (PP (IN of) (NP (NN gas))))))))) (. .)))
Like the other large planets of the outer solar system Jupiter, Saturn, and Neptune Uranus is believed to be mostly composed of gas.
(ROOT (S (NP (NNP Jupiter)) (VP (VBZ is) (NP (NP (DT the) (JJS largest) (NN planet)) (PP (IN in) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))