TASK DEFINITION: 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.
PROBLEM: The Sikorsky S-76 is an American medium-size commercial utility helicopter , manufactured by the Sikorsky Aircraft Corporation .

SOLUTION: The Sikorsky S-76 is an american helicopter .

PROBLEM: 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 .

SOLUTION: Population growth is the rate at which a population grows or expands .

PROBLEM: The distinctive themes and origins of Australia 's bush music can be traced to the songs sung by the convicts who were sent to Australia during the early period of the British colonisation , beginning in 1788 .

SOLUTION:
The beginnings of Australia 's bush music come from the songs sung by the convicts who were sent to Australia from 1788 .