Because of your past support, Girl Scouts has been able to reach out to more of our future leaders---our girls.
( ( Because ( of ( your ( past support ) ) ) ) ( , ( ( Girl Scouts ) ( ( has ( been ( able ( to ( ( reach out ) ( to ( ( ( more ( of ( our ( future leaders ) ) ) ) -- ) ( our girls ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Because) (PP (IN of) (NP (PRP$ your) (JJ past) (NN support)))) (, ,) (NP (NNP Girl) (NNS Scouts)) (VP (VBZ has) (VP (VBN been) (ADJP (JJ able) (S (VP (TO to) (VP (VB reach) (PRT (RP out)) (PP (TO to) (NP (NP (NP (JJR more)) (PP (IN of) (NP (PRP$ our) (JJ future) (NNS leaders)))) (: --) (NP (PRP$ our) (NNS girls)))))))))) (. .)))
Because you never gave before allow us to tell you how your contributions will be used. 
( ( Because ( you ( never ( gave before ) ) ) ) ( ( allow ( us ( to ( ( tell you ) ( how ( ( your contributions ) ( will ( be used ) ) ) ) ) ) ) ) . ) )
(ROOT (S (SBAR (IN Because) (S (NP (PRP you)) (ADVP (RB never)) (VP (VBD gave) (ADVP (RB before))))) (VP (VBP allow) (S (NP (PRP us)) (VP (TO to) (VP (VB tell) (NP (PRP you)) (SBAR (WHADVP (WRB how)) (S (NP (PRP$ your) (NNS contributions)) (VP (MD will) (VP (VB be) (VP (VBN used)))))))))) (. .)))