( ( An ( electrical circuit ) ) ( ( may ( contain ( ( ( ( one or ) more ) switches ) ( that ( ( open or ) ( closes ( the circuit ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (JJ electrical) (NN circuit)) (VP (MD may) (VP (VB contain) (NP (NP (QP (CD one) (CC or) (JJR more)) (NNS switches)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP open)) (CC or) (VP (VBZ closes) (NP (DT the) (NN circuit))))))))) (. .)))
An electrical circuit may contain one or more switches that open or closes the circuit.
(ROOT (NP (NP (NP (DT A) (JJ parallel) (NN circuit)) (VP (VBZ is) (VP (RBS best) (VBN described) (PP (IN as))))) (: :) (NP (NP (NN electricity) (NNS flows)) (PP (IN along) (NP (QP (JJR more) (IN than) (CD one)) (NN pathway))))))