( ( Given ( ( the fact ) ( that ( a neutron ) ) ) ) ( , ( ( a ( subatomic particle ) ) ( ( can ( contain ( ( ( ( ( a ( whole atom ) ) , ) ( the ( hydrogen atom ) ) ) , ) ( means ( that ( atoms ( are ( ( the ( ( ( ( lowest , ) ( the last ) ) , ) ( the ( ( most fundamental ) particle ) ) ) ) ( to exist ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (VBN Given) (NP (NP (DT the) (NN fact)) (PP (IN that) (NP (DT a) (NN neutron))))) (, ,) (NP (DT a) (JJ subatomic) (NN particle)) (VP (MD can) (VP (VB contain) (SBAR (S (NP (NP (DT a) (JJ whole) (NN atom)) (, ,) (NP (DT the) (NN hydrogen) (NN atom)) (, ,)) (VP (VBZ means) (SBAR (IN that) (S (NP (NNS atoms)) (VP (VBP are) (S (NP (DT the) (NP (JJS lowest)) (, ,) (NP (DT the) (JJ last)) (, ,) (NP (DT the) (ADJP (RBS most) (JJ fundamental)) (NN particle))) (VP (TO to) (VP (VB exist)))))))))))) (. .)))
Given the fact that a neutron, a subatomic particle can contain a whole atom, the hydrogen atom, means that atoms are the lowest, the last, the most fundamental particle to exist.
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NNS neutrons)))) (VP (MD can) (VP (VB vary) (PP (IN between) (NP (NP (NNS atoms)) (PP (IN of) (NP (DT the) (JJ same) (NN element))))))) (. .)))