Complex sentence: On 2 March 2012, Prime Minister Julia Gillard announced that Carr would fill a casual vacancy in the Australian Senate caused by the resignation of Mark Arbib, and would become the new Minister for Foreign Affairs in succession to Kevin Rudd.
Split into simpler sentences: On 2 March 2012, Prime Minister Julia Gillard announced that Carr would be nominated to fill a casual vacancy in the Australian Senate caused by the resignation of Mark Arbib. Gillard also announced Carr would become the new Minister for Foreign Affairs in succession to Kevin Rudd.