He was waiting for the Scotland Yard men. 
( He ( ( was ( waiting ( for ( the ( Scotland ( Yard men ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD was) (VP (VBG waiting) (PP (IN for) (NP (DT the) (NNP Scotland) (NNP Yard) (NNS men))))) (. .)))
The Scotland Yard men were coming.
( ( The ( Scotland ( Yard men ) ) ) ( ( were coming ) . ) )
(ROOT (S (NP (DT The) (NNP Scotland) (NNP Yard) (NNS men)) (VP (VBD were) (VP (VBG coming))) (. .)))