( Ethane ( ( is ( ( ( a ( simple hydrocarbon ) ) , ) ( ( a molecule ) ( made ( of ( ( ( two carbon ) and ) ( six ( hydrogen atoms ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Ethane)) (VP (VBZ is) (NP (NP (DT a) (JJ simple) (NN hydrocarbon)) (, ,) (NP (NP (DT a) (NN molecule)) (VP (VBN made) (PP (IN of) (NP (NP (CD two) (NN carbon)) (CC and) (NP (CD six) (NN hydrogen) (NNS atoms)))))))) (. .)))
Ethane is a simple hydrocarbon, a molecule made of two carbon and six hydrogen atoms.
(ROOT (S (NP (NNS Hydrocarbons)) (VP (VBP are) (VP (VBN made) (PP (IN of) (NP (NP (CD one) (NN carbon)) (CC and) (NP (CD four) (NN hydrogen) (NNS atoms)))))) (. .)))
Hydrocarbons are made of one carbon and four hydrogen atoms.