Complex sentence: When the Kazarigs conquered Batbayan, Asparukh fought the battle of Ongal in 680AD to relocate the state's base again to its current location as the Utigur expanded along the Danube lending its name to the modern state of Hungary annexed by the Magyars in the 890sAD.
Split into simpler sentences: When the Kazarigs conquered Batbayan, Asparukh fought the battle of Ongal in 680AD to relocate the state's base again to its current location. As the Utigur expanded along the Danube, Onogur lent its name to the modern state of Hungary before it was annexed by the Magyars in the 890sAD.