Simplify the following text for a Grade 8 native English-speaking person.
Original: It was named by Lieutenant James Cook on 21 August 1770 in honor of Prince Edward , Duke of York and Albany , a brother of King George III of the United Kingdom , who had died three years earlier :
Simplified: It was named by Lieutenant James Cook on 21 August , 1770 , after Prince Edward , Duke of York and Albany .