I'm not sure this is a finished product. On my first and second try, the opening cinematic not only crashed the game after Sauron's death but a few things occurred which I know you did not intend to happen. For example, when Sauron arrives on stage, Elven archers draw him away from his destination and he soon gets cut down. This means Elendil arrives soon after with no one to confront and Isildur after that, even if Sauron is already dead.
A simple fix here might be to create the task effect for Sauron to LOOP and have a timer set to 10 seconds. This way Sauron still has room to fight surrounding enemy forces, but will return to his original destination after only a short moment. To fix the Elven archers taking pot shots at him, which hinders what is supposed to happen, simply set the yellow player to ally with Sauron when he comes on. Set the player to enemy again when Sauron dies. As for the crash, this happens because you have set the change view effect too close to the end of the map. An easy fix would be to create a few change views along the way, easing the "bounce" the change view would create over the whole map.
Given the bugs, I've moved this to Projects. I will move the file back after an update.