(S (S (BASENP (NNS Workers)) (VP (ADVP (RB eventually)) (VP (VBD managed) (S (VP (TO to) (VP (VB begin) (NP (NP (BASENP (NN work)) (PP (IN on) (S (VP (VP (VBG cleaning) (PRT (RP up))) (BASENP (DT the) (NN spill)))))) (COMMA ,) (NP (BASENP (DT an) (NN effort)) (SBAR (WHNP (WDT which)) (S (VP (MD may) (VP (VB be) (ADJP (JJ long-term)))))))))))))) (PERIOD .))