Last year a small number of alumni each contributed between $2,500 and $4,999 to the school.
( ( Last year ) ( ( ( a ( small number ) ) ( of alumni ) ) ( each ( ( ( contributed ( between ( ( ( ( $ 2,500 ) and ) $ ) 4,999 ) ) ) ( to ( the school ) ) ) . ) ) ) )
(ROOT (S (NP (JJ Last) (NN year)) (NP (NP (DT a) (JJ small) (NN number)) (PP (IN of) (NP (NNS alumni)))) (DT each) (VP (VBD contributed) (NP (QP (IN between) ($ $) (CD 2,500) (CC and) ($ $) (CD 4,999))) (PP (TO to) (NP (DT the) (NN school)))) (. .)))
No one contributed any money last year.  
( ( No one ) ( ( ( contributed ( any money ) ) ( last year ) ) . ) )
(ROOT (S (NP (DT No) (NN one)) (VP (VBD contributed) (NP (DT any) (NN money)) (NP (JJ last) (NN year))) (. .)))