Complex sentence: Rippon competed at the 2004 Summer Olympics and the 2008 Summer Olympics on the Australia women's national water polo team but was not chosen to compete at the 2012 Summer Olympics in London.
Split into simpler sentences: Rippon competed at the 2004 Summer Olympics and the 2008 Summer Olympics on the Australia women's national water polo team. She was not chosen to compete at the 2012 Summer Olympics in London.