Complex sentence: Akhmim is the largest town on the east side of the Nile in Upper Egypt, having a population in 1907 of 23,795, of whom about a third were Copts.
Split into simpler sentences: Akhmim is the largest town on the east side of the Nile in Upper Egypt. In 1907, the population of the city was 23,795, of whom about one third were Copts.