Complex sentence: However, demographic changes in the areas north of Blacktown resulted in a shift away from Labor at the 2001 election, and in the 2004 election this trend continued and the seat was won by the Liberal Party by a small margin.
Split into simpler sentences: However, demographic changes in the areas north of Blacktown resulted in a shift away from Labor at the 2001 election. At the 2004 election this trend continued and the seat was won by the Liberal Party by a small margin.