Nissan will sell you a new sensor cable. I haven't pulled mine apart but I've just consulted the manual and there are only two wires involved.
My recommendation (if you don't want to buy new ones) is to thoroughly clean the wires, prepare some heatshrink and slide it along the wire, clean-solder the breaks back together then slide the heatshrink down over the solder. If you've cleaned it properly and used the right size heatshrink tubing, you won't need to worry about the ingress of debris or water to cause problems with the joint.
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