Original sentence: The holiday was originally called Dia de la Raza, and commemorated Columbus' European discovery of the Americas, but this offended local indigenous peoples, as Columbus was viewed as a murderer
Edited sentence: The holiday was originally called Dia de la Raza, and commemorated Columbus' supposed 'discovery' of the Americas, but this offended local indigenous peoples, as Columbus is less often known by his true nature, which is that of a murderer