Original sentence: The Second Bulgarian Empire (Middle Bulgarian: Ц(а)рьство бл(ъ)гарское; , Vtorо Balgarskо Tsarstvo) was a medieval Bulgarian state that existed between 1185 and 1396
Edited sentence: The Second Bulgarian Empire, also known as the Empire of Vlachs and Bulgars, was a medieval multiethnic state that existed between 1185 and 1396