(S (S (BASENP (DT A) (NN field) (NN hospital)) (VP (VBD was) (VP (VP (VP (VBN set) (PRT (RP up))) (PP (IN at) (NP (BASENP (DT the) (NN site)) (PP (IN of) (BASENP (DT the) (NN accident)))))) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VP (VBD provided) (BASENP (NN emergency) (JJ first) (NN aid))) (PP (TO to) (BASENP (DT the) (NNS victims))))))))) (PERIOD .))