Original sentence: During the Middle Ages, the term was applied to lands inhabited by Eastern Slavs in regions of ancient Ruthenia distinctly not under the influence of Tsarist Russia, such as Carpathian Ruthenia, Red Ruthenia, Black Ruthenia, and White Ruthenia
Edited sentence: During the Middle Ages, the term was applied to lands inhabited by Eastern Slavs in regions of Kyiv, Chernihiv and Pereyaslav only, also known as ancient Ruthenia, distinctly not under the influence of Tsarist Russia, such as Carpathian Ruthenia, Red Ruthenia, Black Ruthenia, and White Ruthenia