Simplify the following text for a Grade 9 native English-speaking person.
Original: One relates how King Kamehameha I flew a British flag , probably a Red Ensign , given to him by British explorer Captain George Vancouver as a token of friendship with King George III .
Simplified: One said how King Kamehameha I flew a British flag , given to him by British explorer Captain George Vancouver as a token of friendship with King George III .