Sarah Crane has been removed as the wife of Nathan Russell and the mother of his children. The Family Search "source" mentioned does not mention Sarah's last name. If a valid source is available it should be provided and this connection restablished.
Sources
Family Search Id bK23X-446
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I question the rationale for assuming that Sarah Crane is the wife of Nathan Russell and the merging away of Sarah Unknown. The only source for this Crane connection is a reference to a family tree on FamilySearch, where I cannot find any marriage information. Without some valid documentation or logical argument this leap of faith is likely a red herring. Without adequate sourcing, "Unknown" more truly reflects reality and Sarah Unknown should be reinstated as Nathan's wife.
Unknown-266903 and Crane-5552 appear to represent the same person because: looks like these are the same person, since they are married to same person. One record has the maiden name. Birth date should probably be closer to Nathan's birth year of 1718