Simplify the following text for a Grade 7 native English-speaking person.
Original: The XVII Commonwealth Games was the largest multi-sport event ever to be held in the UK , eclipsing London 's 1948 Summer Olympics in numbers of teams and athletes participating .
Simplified: The XVII Commonwealth Games was the largest multi-sport event ever to be held in England . It was larger than London 's 1948 Summer Olympics in numbers of teams and athletes in the event .