Complex sentence: Anthony John Abbott (born 4 November 1957), widely known as Tony Abbott, is an Australian politician who has been the 28th Prime Minister of Australia since 2013 and Leader of the Liberal Party since 2009.
Split into simpler sentences: Anthony John Abbott (born 4 November 1957), commonly known as Tony Abbott, is the 28th and current Prime Minister of Australia. He has held the position since 2013, and has been the Leader of the Liberal Party since 2009.