Simplify the following text for a Grade 10 native English-speaking person.
Original: Offenhauser 's turbocharged engines returned to Indianapolis in 1966 , with victories coming in 1968 using a Garrett AiResearch turbocharger .
Simplified: Offenhauser 's turbocharged engines first came to Indianapolis in 1966 . Their first victorie came in 1968 using a Garrett AiResearch turbocharger .