( ( ( The elements ) ( of ( hydrogen ( , ( ( potassium and ) carbon ) ) ) ) ) ( ( contain ( ( both ( ( radioactive and ) non-radioactive ) ) atoms ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS elements)) (PP (IN of) (NP (NN hydrogen) (, ,) (NN potassium) (CC and) (NN carbon)))) (VP (VBP contain) (NP (ADJP (DT both) (JJ radioactive) (CC and) (JJ non-radioactive)) (NNS atoms))) (. .)))
The elements of hydrogen, potassium and carbon contain both radioactive and non-radioactive atoms.
(ROOT (S (SBAR (IN Although) (S (NP (PRP they)) (VP (VBP differ) (ADVP (RB vastly)) (PP (IN in) (NP (NNS hardness)))))) (, ,) (NP (NP (NN pencil) (NN lead)) (CC and) (NP (NNS diamonds))) (DT both) (VP (VBP contain) (NP (NN carbon))) (. .)))