So, I'm a little confused with relative clauses and the copula. I was trying to say something like "Things that aren't natural Irish" (Talking about learners and people accepting their mistakes as correct). Would it just be Rudaí nach Gaeilge nádurtha iad? I guess I'm confused about whether there necessarily needs to be a pronoun at the end or not.

Also for things like "Languages that aren't minority languages" (Once again, talking about how people accept poor Irish, where they wouldn't do it for non-minority languages).

Go raibh míle maith 'ad

I think there might be a problem because "things" equates with "natural Irish", ie. a plural with a singular noun.
Maybe it'd be better to say : Rudaí nach bhfuil nádúrtha i nGaeilg, or rudaí nach ndéarfaí i nGaeilg nádúrtha

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

True. But I see "natural Irish" as being a collective, at least in English. So that's probably why I did it. Thanks!