Complex sentence: This was the most major change to the map since 1893 when the ridings were devised, but in that time population shifts had made some change needed, as Charlottetown's population was more then five times that of some of the more rural ridings.
Split into simpler sentences: This was the single most major change to the map since 1893 when the ridings were devised. In that time population shifts had made some change needed, as Charlottetown's population was more then five times that of some of the more rural ridings.