Original sentence: In the 7th century they founded a short-living state known as the Old Great Bulgaria and afterwards two another states: the Volga Bulgaria and  the First Bulgarian Empire.The Bulgars (also Bolgars, Bulghars, Huno-Bulgars or Proto-Bulgarians) were originally semi-nomadic people, probably of Turkic descent, originally from Central Asia, who from the 2nd century onwards dwelled in the steppes north of the Caucasus and around the banks of river Volga (then Itil)
Edited sentence: The Bulgars (also Bolgars, Bulghars, Huno-Bulgars or Proto-Bulgarians) were prolific state builders in Eurasia who founded four states known as Great Bulgaria, Volga Bulgaria, the First Bulgarian Empire and the Second Bulgarian Empire.They were originally semi-nomadic people, probably of Turkic descent, originally from Central Asia, who from the 2nd century onwards dwelled in the steppes north of the Caucasus and around the banks of river Volga (then Itil)