Task: Sentence Expansion
Input (English): Captain George Vancouver ( 22 June 1757 – 10 May 1798 ) was a British officer of the Royal Navy , best known for his 1791 – 95 expedition which explored and mapped the northwest of North America , including the coasts of what are now Alaska , British Columbia , Washington , and Oregon .
Output (English): Captain George Vancouver ( 22 June 1757 – 10 May 1798 ) was a British officer of the Royal Navy best known for his 1791 – 95 expedition , which explored and charted North America 's northwestern Pacific Coast regions , including the coasts of what are now the American states of Alaska , Washington , and Oregon , as well as the province of British Columbia in Canada .