( ( ( Jupiter and ) Saturn ) ( ( ( consist largely ) ( of ( ( hydrogen and ) helium ) ) ) . ) )
(ROOT (S (NP (NNP Jupiter) (CC and) (NNP Saturn)) (VP (VBP consist) (ADVP (RB largely)) (PP (IN of) (NP (NN hydrogen) (CC and) (NN helium)))) (. .)))
Jupiter and Saturn consist largely of hydrogen and helium.
(ROOT (S (NP (NNP Saturn)) (VP (VBZ is) (VP (VBN made) (ADVP (RB mostly)) (PP (IN of) (NP (NN helium) (CC and) (NN hydrogen))))) (. .)))