Simplify the following text for a Grade 11 native English-speaking person.
Original: The studio lot was upgraded and modernized , while MCA clients like Doris Day , Lana Turner , Cary Grant , and director Alfred Hitchcock were signed to Universal Pictures contracts .
Simplified: The studio lot was upgraded and modernized , while MCA clients like Doris Day , Lana Turner , and Cary Grant were signed to Universal Pictures contracts .