Simplify the following text for a Grade 10 native English-speaking person.
Original: In January 1920 , Emanuel Lasker and Capablanca signed an agreement to play a World Championship match in 1921 , noting that Capablanca was not free to play in 1920 .
Simplified: In January 1920 , Emanuel Lasker and Capablanca signed an agreement to play a World Championship match in 1921 .