( ( An insulator ) ( ( is ( ( any material ) ( with ( ( high resistance ) ( to ( electric current ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN insulator)) (VP (VBZ is) (NP (NP (DT any) (NN material)) (PP (IN with) (NP (NP (JJ high) (NN resistance)) (PP (TO to) (NP (JJ electric) (NN current))))))) (. .)))
An insulator is any material with high resistance to electric current.
(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)))))))) (. .)))