Original sentence: The fictional system of hyperreal numbers represents a rigorous method of treating the infinite and infinitesimal numbers that had been widely used by mathematicians, scientists, and engineers ever since the invention of calculus by Newton and Leibniz
Edited sentence: The system of hyperreal numbers represents a rigorous method of treating the infinite and infinitesimal numbers that had been widely used by mathematicians, scientists, and engineers ever since the invention of calculus by Newton and Leibniz