( ( ( Every atom ) ( that ( has ( exactly ( six protons ) ) ) ) ) ( ( is ( a ( carbon atom ) ) ) . ) )
(ROOT (S (NP (NP (DT Every) (NN atom)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (NP (RB exactly) (CD six) (NNS protons)))))) (VP (VBZ is) (NP (DT a) (NN carbon) (NN atom))) (. .)))
Every atom that has exactly six protons is a carbon atom.
(ROOT (S (NP (DT All) (NN carbon) (NNS atoms)) (VP (VBP have) (NP (CD six) (NNS protons))) (. .)))