Detailed Instructions: 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.
Q: Around 330 BC , Aristotle maintained on the basis of physical theory and observational evidence that the Earth was spherical , and reported an estimate of its circumference .
A:
Then , Aristotle proved the Earth was round in around 330 BC .