Complex sentence: Kenyan opposition to British imperialism was there from the start, for example, the Kikuyu opposition of 1880 to 1900, though it bears emphasis that, in military terms, armed uprisings during the opening scenes of British colonialism in Kenya were never successful.
Split into simpler sentences: Kenyan opposition to British imperialism was there from the start, an early example of which was the Kikuyu opposition of 1880 to 1900. It should be noted that, in military terms, armed uprisings during the opening scenes of British colonialism in Kenya were never successful.