Complex sentence: Observations by NASA's Chandra X-ray Observatory show the recent creation of 740 solar masses (stars) per year, considerably higher than the Perseus Cluster, in which stars are formed approximately 20 times slower.
Split into simpler sentences: Observations by NASA's Chandra X-ray Observatory show the recent creation of 740 solar masses (stars) per year. This is considerably higher than the Perseus Cluster, in which stars are formed approximately 20 times slower.