Complex sentence: The original unpublished "End of Eternity" is clearly a different future from that of the Foundation, but Asimov says in his story-postscript that he had some idea of a bridge in the published version.
Split into simpler sentences: The original unpublished "End of Eternity" is clearly a different future from that of the Foundation. But Asimov says in his story-postscript that he had some idea of a bridge in the published version.