( ( By ( ( ( replacing ( ( ( one or ) more ) ( hydrogen atoms ) ) ) ( from ( the hydrocarbon ) ) ) ( by ( ( a ( reactive atom ) ) ( of ( group ( of ( atom X ) ) ) ) ) ) ) ) ( , ( ( a ( new compound ) ) ( ( can ( be formed ) ) . ) ) ) )
(ROOT (S (PP (IN By) (S (VP (VBG replacing) (NP (QP (CD one) (CC or) (JJR more)) (NN hydrogen) (NNS atoms)) (PP (IN from) (NP (DT the) (NN hydrocarbon))) (PP (IN by) (NP (NP (DT a) (JJ reactive) (NN atom)) (PP (IN of) (NP (NP (NN group)) (PP (IN of) (NP (NNP atom) (NNP X)))))))))) (, ,) (NP (DT a) (JJ new) (NN compound)) (VP (MD can) (VP (VB be) (VP (VBN formed)))) (. .)))
By replacing one or more hydrogen atoms from the hydrocarbon by a reactive atom of group of atom X , a new compound can be formed.
(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))))))) (. .)))