Complex sentence: In 1975, the weapons below the rope circle were reorganised so the nulla nulla and axe were superimposed over the boomerang, and were redrawn slightly: one of the major changes being thicker hafts on the crossed weapons.
Split into simpler sentences: In 1975, the weapons below the rope circle were reorganised so the nulla nulla and axe were superimposed over the boomerang. The weapons were also redrawn slightly: one of the major changes being thicker hafts on the crossed weapons.