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)))))) (. .)))
And then your brother came and helped us there.
( And ( then ( ( your brother ) ( ( ( came and ) ( helped ( us there ) ) ) . ) ) ) )
(ROOT (S (CC And) (ADVP (RB then)) (NP (PRP$ your) (NN brother)) (VP (VP (VBD came)) (CC and) (VP (VBD helped) (S (NP (PRP us)) (NP (EX there))))) (. .)))