Complex sentence: Uyezd or uezd was an administrative subdivision of Rus', Muscovy, and Russian Empire used from the 13th century, originally describing groups of several volosts formed around the most important cities.
Split into simpler sentences: Uyezd or uezd was an administrative subdivision of Rus', Muscovy, and Russian Empire used from the 13th century. Originally describing groups of several volosts formed around the most important cities.