Complex sentence: On 8 June 1917, with Lloyd George now Prime Minister, Lee became Director-General of Food Production under Rowland Prothero as President of the Board of Agriculture and Fisheries, having now left the arrmy he was permitted to retain the honorary rank of colonel.
Split into simpler sentences: On 8 June 1917, with Lloyd George now Prime Minister, Lee became Director-General of Food Production under Rowland Prothero as President of the Board of Agriculture and Fisheries. Having now left the arrmy he was permitted to retain the honorary rank of colonel.