( ( Materials ( that ( ( stop electricity ) ( from flowing ) ) ) ) ( ( are ( called insulators ) ) . ) )
(ROOT (S (NP (NP (NNS Materials)) (SBAR (WHNP (WDT that)) (S (VP (VBP stop) (NP (NN electricity)) (PP (IN from) (NP (VBG flowing))))))) (VP (VBP are) (VP (VBN called) (NP (NNS insulators)))) (. .)))
Materials that stop electricity from flowing are called insulators.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (NNS materials)) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (NP (JJ high) (NN resistance)) (PP (TO to) (NP (JJ electric) (JJ current) (JJ electric) (NNS insulators)))))))) (. .)))