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... in praeteritum petens quod ei Vettios, Plautios dissimulavisset, nec...

Apparently "ei...dissimulavit," "he had ei...dissimulavisset: "he had concealed from him (Claudius)." Dat. of separation (?); "dissimulavisset" is pluperf. subj. giving Narcissus' reason: "because (as he said) he had concealed..."