Simplify the following text for a Grade 7 native English-speaking person.
Original: On 16 January , the day before the 2011 Australian Open commenced , a number of players took part in the Rally for Relief which was held at Rod Laver Arena and attended by 15,000 people , which raised A$ 750,000 .
Simplified: On 16 January , the day before the 2011 Australian Open , a number of players took part in the Rally for Relief . This was held at Rod Laver Arena in Melbourne , and 15,000 people went to see it and raised A$ 750,000 .