Nemo fuit qvi non intellegeret Canachi signa rigidiora esse qvam vt imiterentvr veritatem.
Noone was, who did not perceive that Canachus’ statues were too rigid to imitate true form.
I ask because, if ‘vt imiterentur veritatem’ is contigent upon esse and not intellegeret, the sentence is rendered ‘nemo fvit qvi non intellegeret Canachi signa rigidiora esse qvam vt imitentvr veritatem’
As:
Videor demonstrasse qvales essent di.
The indirect question, ‘qvales essent di,’ depends upon the leading verb, demonstrasse(demonstravisse), which is a secondary tense, which demands that the contingent verbs be in the imperfect or pluperfect subjunctive (occasionally in the perfect or present as exigencies may make requisite : Vrbs ita deleta est vt iam non in antiqvvm statvm possit recreari (instead of posset, which can refer to present time but also past and passed past’s future time would lead to ambiguity.))