As the band (which itself morphed over the years, with 'fans' arguing a lot as to which album and which combination was the best, but for my money Stevie Nicks embodied what was best about the band) lived all over the world, they tended to write bits of music and lyrics independently, and often recorded separately. Such was the case with this album, and the Chain as well. It is the only track where all members of the group are credited as having written parts. It is sort of disjointed, but nevertheless works exceptionally well as a finished piece, which says a lot about the sound engineers who worked on it. It was not, however, produced with the band together (AFAIK), instead they all did their bit apart and it was then assembled and mixed, potentially with not one of them present (although I would have to suspect Nicks would have been there - whilst she was a petite lady, she was far from a small personality).
And yes, sorry for the hijack, but it has been a slow summer of no news, and I expect that it will remain so.