It certainly would have been a truly awesome sight to see it split up and have had three similar comets in the sky.
It already has been a once in a lifetime event for me, but you never know what is just around the corner.
This is definitely a case of camera shake! ESO have imaged the comet recently and there is no sign of any breaking up. It is definitely not going to be seen on an unguided tripod mounted camera photo before it is seen in a large telescope, and as others have posted, no one else has seen it visually or photographically. The 2 stars that are visible in the image are quite faint, but the brighter one of them shows hints of the camera shake too, I've indicated it in the attached image. The same offset is seen in the star trail as in the coma.
What looks like the fragmentation of the comet is actually camera movement.
You may notice a couple other marks on your negative(?) that have very similar movement. However I cannot think that created the thrid spot behind the comet.
