Complex sentence: After Arthur Balfour succeeded as Prime Minister, Lord Dudley was on 11 August 1902 sworn of the Privy Council and appointed Lord Lieutenant of Ireland, in which post he displayed great extravagance but also some political and administrative ability.
Split into simpler sentences: After Arthur Balfour succeeded as Prime Minister, Lord Dudley was on 11 August 1902 sworn a member of the Privy Council, and appointed Lord Lieutenant of Ireland. Through his years in Ireland, he displayed great extravagance but also some political and administrative ability.