Simplify the following text for a Grade 6 native English-speaking person.
Original: `` The Greatest Show on Turf '' was the nickname for the St. Louis Rams ' considerably talented and famous record-breaking offense during the 1999 , 2000 , and 2001 National Football League seasons .
Simplified: The Greatest Show on Turf was the nickname for the offense fielded by the St. Louis Rams offense during 1999 , 2000 , and 2001 National Football League seasons .