TASK DEFINITION: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
PROBLEM: It is bounded on the west by the Gulf Stream ; on the north , by the North Atlantic Current ; on the east , by the Canary Current ; and on the south , by the North Atlantic Equatorial Current .

SOLUTION: The sea is bounded on the west by the Gulf Stream , on the north by the North Atlantic Current , on the east by the Canary Current , and on the south by the North Atlantic Equatorial Current , a clockwise-circulating system of ocean currents termed the North Atlantic Gyre .

PROBLEM: The eighteenth edition ( 2012 ) was edited by poet , critic , and editor Geoffrey O 'Brien .

SOLUTION: The eighteenth edition , which came out in 2012 , was edited by poet , critic , and editor Geoffrey O 'Brien ( O 'Brien is also the editor-in-chief of the Library of America ) .

PROBLEM: In cryptography , a Feistel cipher is a symmetric structure used in the construction of block ciphers , named after the German IBM cryptographer ; it is also commonly known as a Feistel network .

SOLUTION:
In cryptography , a Feistel cipher is a symmetric structure used in the construction of block ciphers , named after the German-born physicist and cryptographer Horst Feistel who did pioneering research while working for IBM ( USA ) ; it is also commonly known as a Feistel network .