[Dafni]

Welcome.

Just cut 1cm from the plug, and cut the rest to the desired lenght, if you want to have the connection near the plug. (or do likewise near the servo)
Then de-insulate all wires, solder them together, don't forget the shrink. I always use small shrink tubing on two of them and bigger shrink over all three.
Hope you see what I mean. No big deal, really.