Simplify the following text for a Grade 6 native English-speaking person.
Original: The Farthest Shore is the third of a series of books written by Ursula K. Le Guin and set in her fantasy archipelago of Earthsea , first published in 1972 .
Simplified: The Farthest Shore is the third in a series of books that are written by Ursula K. Le Guin .