The man looked at the girl.
( ( The man ) ( ( looked ( at ( the girl ) ) ) . ) )
(ROOT (S (NP (DT The) (NN man)) (VP (VBD looked) (PP (IN at) (NP (DT the) (NN girl)))) (. .)))
The girl was the man's daughter. 
( ( The girl ) ( ( was ( ( the ( man 's ) ) daughter ) ) . ) )
(ROOT (S (NP (DT The) (NN girl)) (VP (VBD was) (NP (NP (DT the) (NN man) (POS 's)) (NN daughter))) (. .)))