Granddad had seen something one night.
( Granddad ( ( had ( ( seen something ) ( one night ) ) ) . ) )
(ROOT (S (NP (NNP Granddad)) (VP (VBD had) (VP (VBN seen) (NP (NN something)) (NP (CD one) (NN night)))) (. .)))
Grandfather saw a ghost one night.
( Grandfather ( ( ( saw ( a ghost ) ) ( one night ) ) . ) )
(ROOT (S (NP (NNP Grandfather)) (VP (VBD saw) (NP (DT a) (NN ghost)) (NP (CD one) (NN night))) (. .)))