I cut open the braid, inspected the wires and spliced in new wire where need be. Next, soldered (no clean solder) and used shrink tubing. Then I used electrical tape to tape the braid back together
It's not that they are getting pinched, it's that they are being bent over and over again which causes the wire to fracture. No way around this from happening
BMW should have used some heavier gauged wire or one with a thicker jacket. That's what I used when I made the splice.