( Saturn ( ( ( ( ( is ( a ( gas giant ) ) ) , ) and ) ( is ( ( ( ( made up ) mostly ) ( of ( ( hydrogen and ) helium ) ) ) ( in ( gas ( and ( liquid form ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Saturn)) (VP (VP (VBZ is) (NP (DT a) (NN gas) (NN giant))) (, ,) (CC and) (VP (VBZ is) (VP (VBN made) (PRT (RP up)) (ADVP (RB mostly)) (PP (IN of) (NP (NN hydrogen) (CC and) (NN helium))) (PP (IN in) (NP (NN gas) (CC and) (NN liquid) (NN form)))))) (. .)))
Saturn is a gas giant, and is made up mostly of hydrogen and helium in gas and liquid form.
(ROOT (S (NP (NNP Saturn)) (VP (VBZ is) (VP (VBN made) (ADVP (RB mostly)) (PP (IN of) (NP (NN helium) (CC and) (NN hydrogen))))) (. .)))