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.

Example Input: The " population growth rate " is the rate at which the number of individuals in a population increases in a given time period , expressed as a fraction of the initial population .
Example Output: Population growth is the rate at which a population grows or expands .

Example Input: 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 .
Example Output: From 1921 to 1944 , Tuva was a separate country called Tannu-Tuva .

Example Input: After the arrival of the first production 707 in 1957 the Dash 80 was adapted into a general experimental aircraft and used by Boeing to test a variety of new technologies and systems .
Example Output:
After the first 707 was made in 1957 , the Dash 80 was changed into a test planes for other things .