Simplify the following text for a Grade 4 native English-speaking person.
Original: The Oprah Winfrey Show ( often simply referred to as Oprah or just O ) is an American syndicated talk show , hosted and produced by its namesake Oprah Winfrey , and is the highest-rated talk show in American television history .
Simplified: The Oprah Winfrey Show is an American talk show which has Oprah Winfrey as the host .