( ( Most ( of ( the ( organic compounds ) ) ) ) ( ( degraded ( into ( ( the ( straight-chain hydrocarbons ) ) ( that ( comprise ( most ( of petroleum ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (DT the) (JJ organic) (NNS compounds)))) (VP (VBZ degraded) (PP (IN into) (NP (NP (DT the) (JJ straight-chain) (NNS hydrocarbons)) (SBAR (WHNP (WDT that)) (S (VP (VBP comprise) (NP (NP (JJS most)) (PP (IN of) (NP (NN petroleum)))))))))) (. .)))
Most of the organic compounds degraded into the straight-chain hydrocarbons that comprise most of petroleum.
(ROOT (S (NP (DT A) (NN lipid)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT a) (ADJP (RB highly) (JJ diverse)) (NN group)) (PP (IN of) (NP (NP (NNS compounds)) (VP (VBN made) (PRT (RP up)) (ADVP (RB mostly))))) (PP (IN of) (NP (NNS hydrocarbons))))))) (. .)))