Your brother came to help us there.
( ( Your brother ) ( ( came ( to ( ( help us ) there ) ) ) . ) )
(ROOT (S (NP (PRP$ Your) (NN brother)) (VP (VBD came) (S (VP (TO to) (VP (VB help) (NP (PRP us)) (ADVP (RB there)))))) (. .)))
You could have helped us while we were there, but your brother had to come save the day once again.
( ( ( ( ( You ( could ( have ( ( helped us ) ( while ( we ( were there ) ) ) ) ) ) ) , ) but ) ( ( your brother ) ( had ( to ( come ( ( save ( the day ) ) ( once again ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP You)) (VP (MD could) (VP (VB have) (VP (VBN helped) (NP (PRP us)) (SBAR (IN while) (S (NP (PRP we)) (VP (VBD were) (ADVP (RB there))))))))) (, ,) (CC but) (S (NP (PRP$ your) (NN brother)) (VP (VBD had) (S (VP (TO to) (VP (VB come) (VP (VB save) (NP (DT the) (NN day)) (ADVP (RB once) (RB again)))))))) (. .)))