( ( A proton ) ( ( ( ( ( is simply ) ( ( the nucleus ) ( of ( ( ( ( an ( ordinary ( hydrogen atom ) ) ) , ) ( the ( lightest atom ) ) ) , ) ) ) ) and ) ( has ( a ( unit ( positive charge ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN proton)) (VP (VP (VBZ is) (ADVP (RB simply)) (NP (NP (DT the) (NN nucleus)) (PP (IN of) (NP (NP (DT an) (JJ ordinary) (NN hydrogen) (NN atom)) (, ,) (NP (DT the) (JJS lightest) (NN atom)) (, ,))))) (CC and) (VP (VBZ has) (NP (DT a) (NN unit) (JJ positive) (NN charge)))) (. .)))
A proton is simply the nucleus of an ordinary hydrogen atom, the lightest atom, and has a unit positive charge.
(ROOT (S (NP (NP (DT The) (NN nucleus)) (PP (IN of) (NP (DT an) (NN atom)))) (VP (VBZ is) (ADJP (ADJP (JJ positive) (JJ due)) (PP (TO to) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (ADJP (ADVP (RB positively)) (VBN charged)) (NNS protons))))))) (. .)))