( ( ( This combination ) ( of factors ) ) ( ( has ( spurred ( ( antismoking activists ) ( to ( call ( for ( ( a ( complete ban ) ) ( on ( cigarette advertising ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT This) (NN combination)) (PP (IN of) (NP (NNS factors)))) (VP (VBZ has) (VP (VBN spurred) (S (VP (VBG antismoking) (NP (NNS activists)) (S (VP (TO to) (VP (VB call) (PP (IN for) (NP (NP (DT a) (JJ complete) (NN ban)) (PP (IN on) (NP (NN cigarette) (NN advertising)))))))))))) (. .)))
This combination of factors has spurred antismoking activists to call for a complete ban on cigarette advertising.
(ROOT (S (NP (VBG Antismoking) (NNS groups)) (VP (VBP have) (VP (VBN proposed) (SBAR (IN that) (S (NP (NP (NN cigarette) (NN advertising)) (PP (IN in) (NP (DT all) (NNS media)))) (VP (VB be) (VP (VBN banned) (ADVP (RB entirely)))))))) (. .)))