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.

As launch customer , and because of its early involvement before placing a formal order , Pan Am was able to influence the design and development of the 747 to an extent unmatched by a single airline before or since .
Since Pan Am was the launch customer , Pan Am had a big say in the design and making of the 747 .

A game controller , or simply controller , is an input device used with video games or entertainment systems to provide input to a video game , typically to control an object or character in the game .
A game controller is a device used to play video games .

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 .

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