( Typically ( , ( ( a ( single bond ) ) ( ( ( is ( a ( sigma bond ) ) ) ( while ( ( a ( multiple bond ) ) ( is ( ( composed ( of ( one ( sigma bond ) ) ) ) ( together ( with ( ( pi or ) ( other bonds ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Typically)) (, ,) (NP (DT a) (JJ single) (NN bond)) (VP (VBZ is) (NP (DT a) (NN sigma) (NN bond)) (SBAR (IN while) (S (NP (DT a) (JJ multiple) (NN bond)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (CD one) (NN sigma) (NN bond))) (PP (ADVP (RB together)) (IN with) (NP (NP (NN pi)) (CC or) (NP (JJ other) (NNS bonds))))))))) (. .)))
Typically, a single bond is a sigma bond while a multiple bond is composed of one sigma bond together with pi or other bonds.
(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))))) (. .)))