Visigoths sack Rome
( Visigoths ( sack Rome ) )
(ROOT (NP (NNP Visigoths) (NNP sack) (NNP Rome)))
The Visigoths were a peaceful group.
( ( The Visigoths ) ( ( were ( a ( peaceful group ) ) ) . ) )
(ROOT (S (NP (DT The) (NNPS Visigoths)) (VP (VBD were) (NP (DT a) (JJ peaceful) (NN group))) (. .)))