Complex sentence: Succeeding the EOS 5D Mark III, it was announced on 25 August 2016, the Mark IV went on sale later in September with a retail price of $3,499 in the US, £2999 in the UK, and €3569 in the Eurozone.
Split into simpler sentences: Succeeding the EOS 5D Mark III, it was announced on 25 August 2016. The Mark IV is expected to go on sale in September with a retail price of $3,499 in the US, £2999 in the UK, and €3569 in the Eurozone.