( ( Their toilets ) ( ( have ( to ( be ( ( flushed ( multiple times ) ) ( to ( effectively ( ( remove waste ) ( because ( ( a ( single flush ) ) ( ( does not ) ( ( provide ( sufficient momentum ) ) ( to ( ( carry away ) ( solid waste ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ Their) (NNS toilets)) (VP (VBP have) (S (VP (TO to) (VP (VB be) (VP (VBN flushed) (NP (JJ multiple) (NNS times)) (S (VP (TO to) (VP (ADVP (RB effectively)) (VB remove) (NP (NN waste)) (SBAR (IN because) (S (NP (DT a) (JJ single) (NN flush)) (VP (VBZ does) (RB not) (VP (VB provide) (NP (JJ sufficient) (NN momentum)) (S (VP (TO to) (VP (VB carry) (PRT (RP away)) (NP (JJ solid) (NN waste))))))))))))))))) (. .)))
Their toilets have to be flushed multiple times to effectively remove waste because a single flush does not provide sufficient momentum to carry away solid waste.
(ROOT (S (NP (NP (DT The) (NN action)) (PP (IN of) (S (VP (VBG flushing) (NP (DT the) (NN toilet))))) (, ,) (VP (VBN performed) (NP (JJ multiple) (NNS times)) (ADVP (RB daily))) (, ,)) (VP (VBZ is) (NP (NP (DT the) (ADJP (JJ single) (JJS biggest)) (NN use)) (PP (IN of) (NP (NP (NN water)) (PP (IN in) (NP (DT the) (NN home))))))) (. .)))