Complex sentence: Although combat between users is sanctioned in certain areas of the world, these objects have been used to cause disruption in all areas; attacks on the grid itself, such as Grey Goo, are of course strictly forbidden anywhere on the grid.
Split into simpler sentences: Although combat between users is sanctioned in certain areas of the world, these objects have been used to cause disruption in all areas. Attacks on the grid itself, such as Grey Goo, are strictly forbidden anywhere on the grid.