( ( As ( a result ) ) ( , ( ( ( the veins ) ( in ( the legs ) ) ) ( ( might ( ( ( ( ( become distended ) , ) ( making ( ( the valves ) ( unable ( to ( close properly ) ) ) ) ) ) , ) ( causing ( further ( ( distension ( and ( thus varicose ) ) ) veins ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN As) (NP (DT a) (NN result))) (, ,) (NP (NP (DT the) (NNS veins)) (PP (IN in) (NP (DT the) (NNS legs)))) (VP (MD might) (VP (VB become) (ADJP (JJ distended)) (, ,) (S (VP (VBG making) (S (NP (DT the) (NNS valves)) (ADJP (JJ unable) (S (VP (TO to) (VP (VB close) (ADVP (RB properly))))))))) (, ,) (S (VP (VBG causing) (NP (JJ further) (UCP (ADJP (JJ distension)) (CC and) (RB thus) (ADJP (JJ varicose))) (NNS veins)))))) (. .)))
As a result, the veins in the legs might become distended, making the valves unable to close properly, causing further distension and thus varicose veins.
(ROOT (S (NP (JJ Varicose) (NNS veins)) (VP (VBP are) (NP (NP (NNS veins)) (SBAR (WHNP (WDT that)) (S (VP (VBP become) (S (VP (VBG enlarged) (SBAR (IN because) (S (NP (DT the) (NNS valves)) (ADVP (RB no) (RB longer)) (VP (VB close) (ADVP (RB properly)))))))))))) (. .)))