Original sentence: Before the 18th century, Afghanistan was known as a state of Greater Iran called Khorasan.However, Afghanistan was pronounced by its current name in 18th century when Ahmad Shah Durrani formed the new government based on Pashtun rule, and was officially named as Afghanistan during the ruling of Abdur Rahman Khan
Edited sentence: Before the 18th century, only a small part of Afghanistan was known as a state of Greater Iran called Khorasan.However, Afghanistan was pronounced by its current name from 1747 and onwards when Ahmad Shah Durrani formed the new government based on Pashtun rule, and was officially named as Afghanistan during the ruling of Abdur Rahman Khan