Original sentence: In the most recent census 1991 (pre-war), Herzegovina was recorded as having a population of 437,095 inhabitants.The population of Herzegovina throughout history has been ethnically mixed, however the War in Bosnia and Herzegovina was the most recent ethnic cleansing and displacement on a large scale
Edited sentence: The last pre-war census in 1991, recorded a population of 437,095 inhabitants.The population of Herzegovina throughout history has been ethnically mixed, however the recent war resulted in mass ethnic cleansing and  large-scale displacement of peoples