Complex sentence: Of the 1,445,021 biographies on the English Wikipedia as of January 2015, only 15.5 percent were about women, and as a result of sourcing and notability issues, almost all biographies before the 20th century are of men.
Split into simpler sentences: Of the 1,445,021 biographies on the English Wikipedia as of January 2015, only 15.5 percent were about women. Because of sourcing and notability issues, almost all biographies before the 20th century are of men.