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Find an editor and ask that person to help you find a spot to split it. This absolutely can be done; David Eddings's Belgariad series was originally planned to be three books and his publisher had...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/20665 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/20665 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Find an editor and ask that person to help you find a spot to split it. This absolutely can be done; David Eddings's Belgariad series was originally planned to be three books and his publisher had him split it into five. I think it's book 4 which just abruptly _ends_ at a dramatic moment (the group of protagonists is kidnapped and herded off) without wrapping up any of the storylines or coming to even a partial resolution. Stephen R. Donaldson's _A Man Rides Through_ is the first book of two in the Mordant's Need duology (the sequel is _The Mirror of Her Dreams_, published a year later) and also ends smack in the middle of the story. All the plot lines are left wide open. I don't know anything about its publication history, but clearly it was managed. If two books are finished and ready to go, this might be more of a selling point for an agent/publisher, because they don't have to wonder if you have another book in you. Point out that these are "two of four" (or two of six, potentially) and that might even be better.