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So, the chord sequence is maybe Cmaj / Bbmaj / Fmaj. The Bb is subdominant of the (subdominant of C) Fmaj. It's sort of reverse ii - V - I that jazzers are renowned to use.As actually many, many songs utilise. The Bb chord , in a way, is related to the key of C in a 'first- removed' manner.You're right in that the resolution is in 2 plagal cadences, so it sounds fine.The Hendrix song Hey Joe takes the idea a bit further, in E, but then goes C / G / D / A and back to E. Usually, I've heard it move back the way you describe.Considering Sweet Home Alabama, it could be construed that this song uses the same plan -D /C /G., spawning the old question 'Is it in G or D' Answers on a postcard or this site, please !