Visigoths sack Rome
( Visigoths ( sack Rome ) )
(ROOT (NP (NNP Visigoths) (NNP sack) (NNP Rome)))
The Visigoths were not successful.
( ( The Visigoths ) ( ( ( were not ) successful ) . ) )
(ROOT (S (NP (DT The) (NNPS Visigoths)) (VP (VBD were) (RB not) (ADJP (JJ successful))) (. .)))