( ( ( The ( primary elements ) ) ( of ( the sun ) ) ) ( ( are ( ( Hydrogen and ) Helium ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ primary) (NNS elements)) (PP (IN of) (NP (DT the) (NN sun)))) (VP (VBP are) (NP (NNP Hydrogen) (CC and) (NNP Helium))) (. .)))
The primary elements of the sun are Hydrogen and Helium.
(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)))) (. .)))