Complex sentence: Prior to the 2004 federal election there were 423,993 changes to enrolment were processed in the close of roll period; of these, 78,816 were new enrolments and 225,314 were changes of address.
Split into simpler sentences: Prior to the 2004 federal election there were 423,993 changes to enrolment processed before this close of roll period. Of these, 78,816 were new enrolments and 225,314 were changes of address.