( ( A ( typical ( double bond ) ) ) ( ( consists ( of ( ( ( one ( sigma bond ) ) and ) ( one ( pi bond ) ) ) ) ) ; ) )
(ROOT (S (NP (DT A) (JJ typical) (JJ double) (NN bond)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD one) (NN sigma) (NN bond)) (CC and) (NP (CD one) (NN pi) (NN bond))))) (: ;)))
A typical double bond consists of one sigma bond and one pi bond;
(ROOT (S (NP (DT A) (JJ double) (NN bond)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD one) (NN sigma) (NN bond)) (CC and) (NP (CD one) (NN pi) (NN bond))))) (. .)))