must have baffled the folks in the marketing department 
(ROOT (VP (MD must) (VP (VB have) (VP (VBN baffled) (NP (NP (DT the) (NNS folks)) (PP (IN in) (NP (DT the) (NN marketing) (NN department))))))))
(ROOT (VP (MD ) (VP (VB ) (VP (VBN ) (NP (NP (DT ) (NNS )) (PP (IN ) (NP (DT ) (NN ) (NN ))))))))