Simplify the following text for a Grade 8 native English-speaking person.
Original: Kniaz Potemkin signed an order to construct a shipyard on August 27 , 1789 , which is considered to be the city 's birth date .
Simplified: Knyaz Potemkin signed an order to construct a shipyard on August 27 , 1789 , which is considered to be a city birth date .