Original sentence: In 1784, Slovak historian Juraj Sklenár refused the traditional view on the location of Moravia and placed its centrum to the region of Sirmium (now Sremska Mitrovica in Serbia)
Edited sentence: In 1784, Slovak historian Juraj Sklenár tried to change a traditional view on the location of the Great Moravia and placed its centrum to region of ancient Sirmium (now Sremska Mitrovica in Serbia)