Question about instantiate AI

In our game we have several "spawners" that spawn Capsules that act as enemy AI. Whenever we have tried to add a health and damage script, though, and have tried to kill the AI, all AI clones from the same spawners are also killed. I would assume this is because they are clones of one another, but how can we make it so that only one of the AI dies and not all of its clones? Is there an easier way to spawn AI?