"[It must be] [more than ten years] [since I moved to this area]."
[Feumaidh] + [corr is deich bliadhna] + [on a ghluais mi chun na sgìre seo]
I'm sure it's:
Feumaidh gu bheil e corr is deich bliadhna on a ghluais mi chun na sgìre seo.
and not, as another part of my brain is trying to convince me:
Feumaidh gur e corr is deich bliadhna a th' ann on a ghluais mi chun na sgìre seo.
I think the thing is I'm not sure if the "corr is" phrase is a noun phrase.