In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
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Question: The atomic radius of a chemical element is a measure of the size of its atoms , usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons .

Answer: The atomic radius of an element is the distance between the nucleus and the edge of the electron cloud .

Question: From 1921 to 1944 , Tuva constituted a sovereign , independent nation under the name of Tannu Tuva , officially , the Tuvan People 's Republic , or the People 's Republic of Tannu Tuva .

Answer: From 1921 to 1944 , Tuva was a separate country called Tannu-Tuva .

Question: Chevrolet , colloquially referred to as Chevy and formally the Chevrolet Division of General Motors Company , is an American automobile division of the American manufacturer General Motors ( GM ) .

Answer:
Chevrolet , also known as Chevy , is an automobile manufacturing company owned by General Motors .