Simplify the following text for a Grade 9 native English-speaking person.
Original: Cosworth increased its association with Ford in 1969 , by developing a double overhead camshaft ( DOHC ) 16-valve inline four cylinder engine for road use in the Ford Escort .
Simplified: Cosworth increased its work with Ford in 1969 . Cosworth developed a double overhead camshaft ( DOHC ) 16-valve inline four cylinder engine for road use in the European Ford Escort .