(S (S (S (BASENP (DT Two) (NNS firefighters)) (VP (VBD were) (VP (VP (VBN killed) (PP (IN in) (BASENP (DT the) (NN blaze)))) (PP (IN on) (BASENP (NNP Sunday)))))) (COMMA ,) (SBAR (IN after) (S (BASENP (NNS fires)) (VP (VBD burnt) (NP (BASENP (PRPD their) (NN vehicle)) (PP (IN on) (BASENP (JJ front) (NNS lines)))))))) (PERIOD .))