( ( ( The material ) ( that ( ( prevents electricity ) ( from ( ( ( flowing through ) or ) leaking ) ) ) ) ) ( ( is ( called ( ( an insulator ) ( of electricity ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN material)) (SBAR (WHNP (WDT that)) (S (VP (VBZ prevents) (NP (NN electricity)) (PP (IN from) (S (VP (VP (VBG flowing) (PRT (RP through))) (CC or) (VP (VBG leaking))))))))) (VP (VBZ is) (VP (VBN called) (NP (NP (DT an) (NN insulator)) (PP (IN of) (NP (NN electricity)))))) (. .)))
The material that prevents electricity from flowing through or leaking is called an insulator of electricity.
(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)))))))) (. .)))