( and ( ( a circuit ) ( ( is ( ( ( a pathway ) ( for ( electric current ) ) ) ( to follow ) ) ) . ) ) )
(ROOT (S (CC and) (NP (DT a) (NN circuit)) (VP (VBZ is) (NP (NP (DT a) (NN pathway)) (PP (IN for) (NP (JJ electric) (NN current))) (S (VP (TO to) (VP (VB follow)))))) (. .)))
and a circuit is a pathway for electric current to follow.
(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))))))