Simplify the following text for a Grade 13 native English-speaking person.
Original: The square separates the Kremlin , the former royal citadel and currently the official residence of the President of Russia , from a historic merchant quarter known as Kitay-gorod ( China-Town ) .
Simplified: The square separates the Kremlin , the former royal citadel and currently the official residence of the President of Russia , from a historic merchant quarter known as Kitai-gorod .