Your contribution to Goodwill will mean more than you may know.
( ( ( Your contribution ) ( to Goodwill ) ) ( ( will ( mean ( more ( than ( you ( may know ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (PRP$ Your) (NN contribution)) (PP (TO to) (NP (NNP Goodwill)))) (VP (MD will) (VP (VB mean) (ADVP (ADVP (RBR more)) (SBAR (IN than) (S (NP (PRP you)) (VP (MD may) (VP (VB know)))))))) (. .)))
You may not realize the complete impact of your contribution.
( You ( ( ( may not ) ( realize ( ( the ( complete impact ) ) ( of ( your contribution ) ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (MD may) (RB not) (VP (VB realize) (NP (NP (DT the) (JJ complete) (NN impact)) (PP (IN of) (NP (PRP$ your) (NN contribution)))))) (. .)))