( ( Most ( of ( ( ( the hydrogen ) and ) ( helium ( in ( the Universe ) ) ) ) ) ) ( ( was ( created then ) ) . ) )
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (DT the) (NN hydrogen)) (CC and) (NP (NP (NNP helium)) (PP (IN in) (NP (DT the) (NNP Universe))))))) (VP (VBD was) (VP (VBN created) (ADVP (RB then)))) (. .)))
Most of the hydrogen and helium in the Universe was created then.
(ROOT (S (NP (NNP Saturn)) (VP (VBZ is) (VP (VBN made) (ADVP (RB mostly)) (PP (IN of) (NP (NN helium) (CC and) (NN hydrogen))))) (. .)))