( ( This hydrogen ) ( ( will ( fuse ( to ( make helium ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN hydrogen)) (VP (MD will) (VP (VB fuse) (S (VP (TO to) (VP (VB make) (NP (NNP helium))))))) (. .)))
This hydrogen will fuse to make 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))))) (. .)))