( ( ( Most ( carbon atoms ) ) ( in ( the world ) ) ) ( ( have ( ( ( six protons ) and ) ( ( six neutrons ) ( in ( their nucleus ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most) (NN carbon) (NNS atoms)) (PP (IN in) (NP (DT the) (NN world)))) (VP (VBP have) (NP (NP (CD six) (NNS protons)) (CC and) (NP (NP (CD six) (NNS neutrons)) (PP (IN in) (NP (PRP$ their) (NN nucleus)))))) (. .)))
Most carbon atoms in the world have six protons and six neutrons in their nucleus.
(ROOT (S (NP (NNP Carbon) (NNS atoms)) (VP (VBP have) (NP (NP (CD six) (NNS neutrons)) (CONJP (RB as) (RB well) (IN as)) (NP (CD six) (NNS protons)))) (. .)))