( ( Source ( After hydrogen ) ) ( , ( helium ( ( is ( ( the ( second ( ( most abundant ) element ) ) ) ( in ( the universe ) ) ) ) . ) ) ) )
(ROOT (S (PP (NP (NN Source)) (IN After) (NP (NN hydrogen))) (, ,) (NP (NNP helium)) (VP (VBZ is) (NP (NP (DT the) (JJ second) (ADJP (RBS most) (JJ abundant)) (NN element)) (PP (IN in) (NP (DT the) (NN universe))))) (. .)))
Source After hydrogen, helium is the second most abundant element in the universe.
(ROOT (S (NP (NNP Hydrogen)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ abundant)) (NN element)) (PP (IN in) (NP (DT the) (NN universe))))) (. .)))