I don't understand what it means by 196.85' (60 m) ISO100 at 200 mm position

You're looking at a unit where the flash head zooms to change the area that's illuminated. The head moves toward the front to light a wider area, and toward the back to light a narrow area. Changing the area that's illuminated means that the intensity of light per unit area changes, so the guide number is different depending on the position of the head. The positions indicated (105mm and 200mm in your example) correspond to focal lengths on your lens.

Guide Number is the product of distance and aperture, so a guide number of 60m tells you that the flash will provide enough light to properly illuminate a scene 15 meters away when the camera is set to f/4, or 30 meters away when the camera is at f/2. If you zoom the flash head to a different position, like 150mm, then the guide number will be lower (because the light is being dispersed over a larger area).

Some DSLRs can communicate with certain flash models to automatically adjust the flash's zoom to match the focal length that a zoom lens is set to, so that the whole frame is lit by the flash. For example, Canon's EOS cameras can send zoom information to Canon EX speedlights that support zooming.