Complex sentence: With reinforcements from India and when Operation Compass in Egypt made troops available for redeployment from Egypt, the British planned to invade Eritrea on 9 February 1941 but were forestalled by the Italians retreating from Kassala on 18 January 1941 and Platt was ordered to mount vigorous pursuit.
Split into simpler sentences: With reinforcements from India and when Operation Compass in Egypt made troops available for redeployment from Egypt, the British planned to invade Eritrea on 9 February 1941. The British were forestalled by a sudden Italian retreat from Kassala on 18 January 1941 and Platt was ordered to mount a vigorous pursuit.