( ( Materials ( that ( strongly ( resist ( ( the movement ) ( of charge ) ) ) ) ) ) ( ( ( ( ( ( are ( called ( electrical insulators ) ) ) , ) or ) just ) insulators ) . ) )
(ROOT (S (NP (NP (NNS Materials)) (SBAR (WHNP (WDT that)) (S (ADVP (RB strongly)) (VP (VBP resist) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (NN charge)))))))) (VP (VP (VBP are) (VP (VBN called) (NP (JJ electrical) (NNS insulators)))) (, ,) (CC or) (ADVP (RB just)) (VP (VBZ insulators))) (. .)))
Materials that strongly resist the movement of charge are called electrical insulators, or just 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)))))))) (. .)))