Simplify the following text for a Grade 8 native English-speaking person.
Original: Starting with the 2008 Royal Rumble , all WWE pay-per-views are broadcast in North America in High-definition , with similar HD broadcasts starting in the United Kingdom and Ireland from WrestleMania XXIV .
Simplified: Starting with the 2008 Royal Rumble , all WWE pay-per-views were broadcast in High-definition .