( But ( ( ( ( ( ( ( that ( stomach pain ) ) , ) fever ) , ) and ) headache ) ( ( may ( be ( ( the result ) ( of ( ( ( a ( foodborne illness ) ) , ) ( what ( we ( usually ( call ( food poisoning ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (CC But) (NP (NP (DT that) (NN stomach) (NN pain)) (, ,) (NP (NN fever)) (, ,) (CC and) (NP (NN headache))) (VP (MD may) (VP (VB be) (NP (NP (DT the) (NN result)) (PP (IN of) (NP (NP (DT a) (JJ foodborne) (NN illness)) (, ,) (SBAR (WHNP (WP what)) (S (NP (PRP we)) (ADVP (RB usually)) (VP (VBP call) (NP (NN food) (NN poisoning)))))))))) (. .)))
But that stomach pain, fever, and headache may be the result of a foodborne illness, what we usually call food poisoning.
(ROOT (S (NP (NNP Food) (NNP poisoning)) (VP (VBZ is) (NP (NP (DT another) (NN term)) (PP (IN for) (NP (JJ foodborne) (NN illness))))) (. .)))