( ( Materials ( with ( high resistance ) ) ) ( , ( ( like ( ( Plexiglas and ) rubber ) ) ( , ( ( are ( ( ( called insulators ) , ) ( since ( they ( ( ( do not ) easily ) ( ( allow electricity ) ( to ( pass ( through them ) ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NP (NNS Materials)) (PP (IN with) (NP (JJ high) (NN resistance)))) (, ,) (PP (IN like) (NP (NNPS Plexiglas) (CC and) (NN rubber))) (, ,) (VP (VBP are) (VP (VBN called) (NP (NNS insulators)) (, ,) (SBAR (IN since) (S (NP (PRP they)) (VP (VBP do) (RB not) (ADVP (RB easily)) (VP (VB allow) (NP (NN electricity)) (S (VP (TO to) (VP (VB pass) (PP (IN through) (NP (PRP them)))))))))))) (. .)))
Materials with high resistance, like Plexiglas and rubber, are called insulators, since they do not easily allow electricity to pass through them.
(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)))))))) (. .)))