( Eddington ( ( suggested ( that ( ( ( the fusion ) ( of ( ( ( ( hydrogen , ) ( ( the ( ( most common ) element ) ) ( in ( the Sun ) ) ) ) , ) ( into helium ) ) ) ) ( provides ( ( the ( enormous ( energy output ) ) ) ( of ( the Sun ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Eddington)) (VP (VBD suggested) (SBAR (IN that) (S (NP (NP (DT the) (NN fusion)) (PP (IN of) (NP (NP (NP (NN hydrogen)) (, ,) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN element)) (PP (IN in) (NP (DT the) (NNP Sun)))) (, ,)) (PP (IN into) (NP (NNP helium)))))) (VP (VBZ provides) (NP (NP (DT the) (JJ enormous) (NN energy) (NN output)) (PP (IN of) (NP (DT the) (NNP Sun)))))))) (. .)))
Eddington suggested that the fusion of hydrogen, the most common element in the Sun, into helium provides the enormous energy output of the Sun.
(ROOT (S (NP (DT The) (NN sun)) (ADVP (RB mostly)) (VP (VBD made) (PRT (RP up)) (PP (IN of) (NP (DT the) (NN element) (NN hydrogen)))) (. .)))