Complex sentence: Since its extension eastwards to Caulfield and other Liberal-voting areas in the 1990 redistribution, it has become much less secure for Labor, and was almost lost in 2013 election, Labor was returned with a primary vote of less than 32 percent.
Split into simpler sentences: Since its extension eastwards to Caulfield and other Liberal-voting areas in the 1990 redistribution, it has become much less secure for Labor. Continuing the gradual downwards trend in the Labor primary vote, in the 2013 election, Labor was returned with a primary vote of less than 32 percent.