そして、 いま時代は大きく動きだそうとしていた
And now the time was about to/was going to change dramatically.
It's from Naruto. Kakashi is explaining how the Naruto universe works.
I'm not sure what として does here. Is it the particle と marking "a manner of doing something" + する. If so, what does する mean here? or is it として as in "as?"