Simplify the following text for a Grade 7 native English-speaking person.
Original: Three years later , at the 117th IOC Session , the first major program revision was performed , which resulted in the exclusion of baseball and softball from the official program of the 2012 London Games .
Simplified: Three years later , at the 117th IOC Session , the first major change to the list was performed . This resulted in the removal of baseball and softball from the list of sports for the 2012 London Games .