Those connections are generally swaged on and are not removable.. and if you cut it off, cleaned up the cable and reattached a (new) fitting, you'd be several inches shorter and probably won't have the room in the turnbuckle to make up the difference... If the cable kink is serious it looks like you're getting a new stay.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"