Simplify the following text for a Grade 7 native English-speaking person.
Original: It became known as the `` Water Ski Capital of the World '' because many of the sport 's landmark firsts and the over 50 world records broken there .
Simplified: It became known as the `` Water Ski Capital of the World '' because many of the sport 's major `` firsts '' and over 50 world records were broken there .