Simplify the following text for a Grade 8 native English-speaking person.
Original: With his fastest lap being 1.3 seconds faster than World Champion Sebastian Vettel 's qualifying lap the Saturday before , Ricciardo remained unbeaten in Formula One tests he had been involved in .
Simplified: His fastest lap was 1.3 seconds faster than Sebastian Vettel 's qualifying lap the Saturday before . Ricciardo remained unbeaten in Formula One tests he has attended .