Now, we are going to rewrite this sentence:
I declare war against Denmark, France, and Germany, because they have attacked us for a non-apparent reason.
They have attacked us for a non-apparent reason; there I declare war against Denmark, France, and Germany.
Denmark, France, and Germany have attacked us for a non-apparent reason; therefore I declare war against the countries.
For a non-apparent reason, Denmark, France, and Germany have attacked us; therefore I declare war against the countries.
Having attacked us for a non-apparent reason, I declare war against Denmark, France and Germany.
Against Denmark, France, and Germany, I declare war, since they attacked us for a non-apparent reason.