Script not applying to imported Blender Model

Go easy on me, I have only been working in unity for a couple weeks now. I have it where when a game object has a script I made applied to it, the object can be attacked then destroyed. This works. So for example I can make a sphere, apply the script, my character hits it, and the sphere disappears. When I import say, a blender model of a snake I made, The script no longer works and I can not destroy the snake. I do get the error "The hull has more than 255 polygons" or whatever from unity when i import my snake, is this causing the problem? How do I fix this So I can attack my model and it disappears? Thank you!