Simplify the following text for a Grade 15 native English-speaking person.
Original: The Music Corporation of America ( better known as MCA ) , mainly a talent agency , had also become a powerful television producer , renting space at Republic Studios for its Revue Productions subsidiary .
Simplified: The Music Corporation of America ( better known as MCA ) , mainly a talent agency , had also become a powerful television producer , renting space at Republic Studios for its Revue Studios subsidiary .