Simplify the following text for a Grade 8 native English-speaking person.
Original: Vengeance grossed over $ 400,000 in ticket sales from an attendance of 6,800 and received 320,000 pay-per-view buys , which helped WWE increase its pay-per-view revenue by $ 21.6 million compared to the previous year .
Simplified: Vengeance made over $ 400,000 in ticket sales from an attendance of 6,800 and received 320,000 pay-per-view buys , which helped WWE increase its pay-per-view revenue by $ 21.6 million compared to the year before .