(S (S (SBAR (ADVP (RB Shortly)) (SBAR (IN after) (S (BASENP (DT the) (NN outbreak)) (VP (VBD began))))) (COMMA ,) (S (BASENP (DT the) (JJ contaminated) (NN spinach)) (VP (VBD had) (VP (VBN been) (VP (VBN traced) (PP (TO to) (NP (BASENP (DT the) (NNP Salinas) (NNP Valley) (NN region)) (PP (IN of) (BASENP (NNP California)))))))))) (PERIOD .))