However, their cumulative effect tends to be overpowering.
( However ( , ( ( their ( cumulative effect ) ) ( ( tends ( to ( be overpowering ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (PRP$ their) (JJ cumulative) (NN effect)) (VP (VBZ tends) (S (VP (TO to) (VP (VB be) (ADJP (JJ overpowering)))))) (. .)))
Their cumulative effect has very little effect, if at all.
( ( ( ( ( Their ( cumulative effect ) ) ( has ( ( very little ) effect ) ) ) , ) ( if ( at all ) ) ) . )
(ROOT (S (S (NP (PRP$ Their) (JJ cumulative) (NN effect)) (VP (VBZ has) (NP (ADJP (RB very) (JJ little)) (NN effect)))) (, ,) (FRAG (IN if) (ADVP (IN at) (DT all))) (. .)))