Help with creating an animation from right to left

[rich2005]

I looked at this yesterday and not really understanding the question. 

If it is, starting with this

   

..and using the frames of that animation to give this

   

..but not sure that is the requirement.
The crunch is "Is there an easier way?"  I offset individual frames before rotating the image. Not quick.
Possibly an easier way is not Gimp, maybe ImageMagick