Complex sentence: On 7 October 2009 E.ON postponed the replacement until at least 2016, before 20 October 2010 when it was announced that the proposal had been shelved.
Split into simpler sentences: On 7 October 2009 E.ON postponed the replacement until at least 2016. On 20 October 2010 it was announced that the build of the replacement had been shelved.