Complex sentence: A generation later another group of Boers descended from Trekboere resist the administration of British legislation in 1815 which led to a rebellion at Slagters Nek in which the British executed some of the Boer leaders of the rebellion.
Split into simpler sentences: A generation later another group of Boers resisted the administration of British legislation in 1815. This led to a rebellion at Slagters Nek in which the British executed some of the Boer leaders of the rebellion.