Original sentence: The Kingdom of Serbia was established in the 11th century, and in the 13th century it eventually became the Serbian Empire
Edited sentence: After they immigrated into present location from their original lands, somewhere in modern day Ukraine or Russia, The Kingdom of Serbia was established in the 11th century, and in the 13th century it eventually became the Serbian Empire.It is reknown for commiting genocide, killing women and children and causing enormous suffering to innocent civilians