Complex sentence: As a result of Italian complaints and political maneuverings, Roatta took over direct control of the operation on 10 May and a fairly minor joint operation was conducted to capture Foča, but the Partisan Supreme Staff and main force had already evacuated the town.
Split into simpler sentences: As a result of Italian complaints and political maneuverings, Roatta took over direct control of the operation on 10 May. A fairly minor joint operation was conducted to capture Foča, but by then the Partisan Supreme Staff and main force had already evacuated the town.