The Campaign is directed at law firms and businesses having 10 or more alumni.
( ( The Campaign ) ( ( is ( directed ( at ( ( law ( ( firms and ) businesses ) ) ( having ( ( ( 10 or ) more ) alumni ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN Campaign)) (VP (VBZ is) (VP (VBN directed) (PP (IN at) (NP (NP (NN law) (NNS firms) (CC and) (NNS businesses)) (VP (VBG having) (NP (QP (CD 10) (CC or) (JJR more)) (NNS alumni))))))) (. .)))
The campaign is directed to businesses with at least 10 alumni. 
( ( The campaign ) ( ( is ( directed ( to ( businesses ( with ( ( ( at least ) 10 ) alumni ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN campaign)) (VP (VBZ is) (VP (VBN directed) (PP (TO to) (NP (NP (NNS businesses)) (PP (IN with) (NP (QP (IN at) (JJS least) (CD 10)) (NNS alumni))))))) (. .)))