Complex sentence: Their baptism of fire came during the Langalibalele Rebellion in 1873 where they suffered their first casualties in action in the Drakensberg and during the Anglo-Zulu War, the Carbineers suffered heavy losses at the Battle of Isandlwana on 22 January 1879.
Split into simpler sentences: Their baptism of fire came during the Langalibalele Rebellion in 1873 where they suffered their first casualties in action in the Drakensberg. Subsequently, during the Anglo-Zulu War, the Carbineers suffered heavy losses at the Battle of Isandlwana on 22 January 1879.