Complex sentence: Freeing Julia, he instructs her to electrocute him, killing him shortly but deactivating the explosive, from which she can revive him, as well as instructing her how to use a gun for her protection.
Split into simpler sentences: Freeing Julia, he instructs her to electrocute him, "killing" him temporarily but deactivating the explosive, from which she can revive him. He also instructs her in how to use a gun for her protection.