( ( ( ( Close-up ( of ( a ( hydrogen atom ) ) ) ) , ) ( with ( ( one electron ) ( orbiting ( one proton ) ) ) ) ) . )
(ROOT (NP (NP (VBG Close-up)) (PP (IN of) (NP (DT a) (NN hydrogen) (NN atom))) (, ,) (PP (IN with) (NP (NP (CD one) (NN electron)) (VP (VBG orbiting) (NP (CD one) (NN proton))))) (. .)))
Close-up of a hydrogen atom, with one electron orbiting one proton.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD one) (NNS electrons)) (PP (IN in) (NP (DT the) (NN hydrogen) (NN atom))))) (. .)))