The stitching pulls apart because the leather dries out, becomes less flexible and overloads the stitching. To repair the seat you have two options, recover with new leather or get the old leather flexible and restitch what you have.
To renurish the leather you have, use Neatsfoot oil liberally to the pulled a part area. Apply several times to the failed area. Once the leather is renurished, the stitching can be replaced repairing the seat. Sometimes the leather is so dried out that you cannot get it flexible enough to restitch. At that point it's either find a new seat back for your car or get the existing seat recovered with new leather.
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