( ( An ion ) ( ( is ( ( an atom ) ( which ( has ( either ( ( ( a ( net positive ) ) or ) ( net ( negative charge ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN ion)) (VP (VBZ is) (NP (NP (DT an) (NN atom)) (SBAR (WHNP (WDT which)) (S (VP (VBZ has) (NP (CC either) (NP (DT a) (JJ net) (NN positive)) (CC or) (NP (JJ net) (JJ negative) (NN charge)))))))) (. .)))
An ion is an atom which has either a net positive or net negative charge.
(ROOT (S (NP (DT An) (NN ion)) (VP (VBZ is) (NP (NP (DT an) (NN atom) (CC or) (NN group)) (PP (IN of) (NP (NP (VBN bonded) (NNS atoms)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (NP (DT a) (ADJP (JJ positive) (CC or) (JJ negative)) (NN charge))))))))) (. .)))