Simplify the following text for a Grade 7 native English-speaking person.
Original: Ares V and the smaller Ares I were named after Ares , the Greek god of war , which is the equivalent to the Roman god Mars .
Simplified: Upon completion the Ares V will be the most powerful rocket ever built , lifting more into orbit than even the Saturn V. Ares V , Ares IV , and Ares I are named after Ares , the Greek god , which is the equivalent to the Roman god Mars .