Complex sentence: He was promoted to temporary lieutenant-general on 12 December 1914 and given command of the Australian and New Zealand Army Corps which was despatched to capture the Gallipoli peninsula and carried out a landing at Anzac Cove on 25 April 1915.
Split into simpler sentences: He was promoted to temporary lieutenant-general on 12 December 1914. This Australian and New Zealand Army Corps was despatched to capture the Gallipoli peninsula and carried out a landing at Anzac Cove on 25 April 1915.