Their actions saved the lives of countless others, and may have saved either the Capitol or the White House from destruction.
( ( Their actions ) ( ( ( ( ( saved ( ( the lives ) ( of ( countless others ) ) ) ) , ) and ) ( may ( have ( ( saved ( either ( ( ( the Capitol ) or ) ( the ( White House ) ) ) ) ) ( from destruction ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ Their) (NNS actions)) (VP (VP (VBD saved) (NP (NP (DT the) (NNS lives)) (PP (IN of) (NP (JJ countless) (NNS others))))) (, ,) (CC and) (VP (MD may) (VP (VB have) (VP (VBN saved) (PP (CC either) (NP (NP (DT the) (NNP Capitol)) (CC or) (NP (DT the) (NNP White) (NNP House)))) (PP (IN from) (NP (NN destruction))))))) (. .)))
They did not help anyone in the White House.
( They ( ( ( did not ) ( ( help anyone ) ( in ( the ( White House ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD did) (RB not) (VP (VB help) (NP (NN anyone)) (PP (IN in) (NP (DT the) (NNP White) (NNP House))))) (. .)))