Original sentence: Istanbul (; historically Byzantium and Constantinople; see the other names of Istanbul) is the largest city in Turkey, largest city proper and second largest metropolitan area in Europe, and fifth largest city proper in the world with a population of 12.6 million
Edited sentence: Constantinople (; historically Byzantium see the other names of Istanbul) is the largest city in Turkey, largest city proper and second largest metropolitan area in Europe, and fifth largest city proper in the world with a population of 12.6 million