( Helium ( ( ( ( is ( ( the ( second ( ( most abundant ) element ) ) ) ( in ( the ( known universe ) ) ) ) ) , ) ( after hydrogen ) ) . ) )
(ROOT (S (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) (JJ known) (NN universe)))) (, ,) (PP (IN after) (NP (NN hydrogen)))) (. .)))
Helium is the second most abundant element in the known universe, after hydrogen.
(ROOT (S (NP (DT The) (NN element) (NN hydrogen)) (VP (VBZ is) (NP (NP (DT the) (RBS most) (JJ abundant)) (PP (IN in) (NP (DT the) (NN universe))))) (. .)))
The element hydrogen is the most abundant in the universe.