Complex sentence: Today, the built-in barriers to the hiring and promotion of Francophones seems not only to have been overcome, but to have produced an over-representation of persons with French as their mother tongue in the Public Service.
Split into simpler sentences: Today, the built-in barriers to the hiring and promotion of francophones seem to have been overcome. There is now a slight over-representation of persons with French as their first official language in the Public Service.