Enabling script after the last one destroyed

I am making miner game and I want to add random generation for my mining area, I want to generate it by layer I found simple way to do it and its working, but I have a little problem, the game master has 2 of the same script the first script has 1 job is generate 200 cubes move spawn points down and destroy its self and the second script have to do the same thing but its still disabled, I want to enable the second script after the first script destroyed