Simplify the following text for a Grade 11 native English-speaking person.
Original: In 1946 , Robinson arrived at Daytona Beach , Florida , for spring training with the Montreal Royals of the Class AAA International League ( the designation of `` AAA '' for the highest level of minor league baseball was first used in the season ) .
Simplified: In 1946 , Robinson arrived at Daytona Beach , Florida , for spring training with the Montreal Royals of the Class AAA International League .