(S (S (BASENP (NNS Providers)) (VP (MD must) (VP (VP (VP (VB sharpen) (PRT (RP up))) (PP (IN on) (BASENP (PRPD their) (NN advertising)))) (CC and) (VP (VB improve) (NP (BASENP (DT the) (NN performance)) (PP (IN of) (BASENP (PRPD their) (NN service) (NNS desks)))))))) (PERIOD .))