Simplify the following text for a Grade 8 native English-speaking person.
Original: In 2003 , Roethlisberger led his team to an unbeaten record , a Number 10 ranking in the Associated Press poll and a 49-28 victory over Louisville in the 2003 GMAC Bowl .
Simplified: In 2003 , Roethlisberger led the Miami RedHawks to an unbeaten record in the MAC , a No. 10 ranking in the Associated Press poll and a 49-28 victory over Louisville in the 2003 GMAC Bowl .