That is called body side moulding. The 4 pieces that are closest to the bumper covers have studs that go through the fenders and speed nuts. Take off the speed nuts. The others are mounted with mounting tape. Take a fishing line, piano wire, or a PVC pipe cutter to go through the tape. Be careful not to bend the mouldings so they will not warp.
For $10, I'll also tell you the best way to clean them up and put them back on.