Original sentence: The closest Sudanese town south of the disputed area is Osief (Marsa Osief), located  south of latitude 22, the political border line claimed by Egypt based on the 1899 agreement
Edited sentence: The closest Sudanese town south of the disputed area is Osief (Marsa Osief), located  south of latitude 22, the political border line declared by the 1899 agreement between Egypt and United Kingdom