Complex sentence: Observations show the bright nebulosity has temperatures between 7,000--9,000 K, whose densities average of about 5,000 particles/cm³ and a. The outer halo has the higher temperature around 15,000 K, but is of much lower density.
Split into simpler sentences: Observations show the bright nebulosity has temperatures between 7,000--9,000 K, whose densities average of about 5,000 particles/cm³. Its outer halo has the higher temperature around 15,000 K, but is of much lower density.