A proportionately large number of you responded to that survey.
( ( ( A ( ( proportionately large ) number ) ) ( of you ) ) ( ( responded ( to ( that survey ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (ADJP (RB proportionately) (JJ large)) (NN number)) (PP (IN of) (NP (PRP you)))) (VP (VBD responded) (PP (TO to) (NP (DT that) (NN survey)))) (. .)))
Overall a large percentage of you participated in our study when compared to members in other groups.
( Overall ( ( ( a ( large percentage ) ) ( of you ) ) ( ( ( participated ( in ( our study ) ) ) ( when ( compared ( to ( members ( in ( other groups ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Overall)) (NP (NP (DT a) (JJ large) (NN percentage)) (PP (IN of) (NP (PRP you)))) (VP (VBD participated) (PP (IN in) (NP (PRP$ our) (NN study))) (SBAR (WHADVP (WRB when)) (S (VP (VBN compared) (PP (TO to) (NP (NP (NNS members)) (PP (IN in) (NP (JJ other) (NNS groups))))))))) (. .)))