Complex sentence: In January 1879 he invaded Zululand (see Anglo-Zulu War), but the central column of his forces was defeated at the Battle of Isandlwana and because an invasion of Natal seemed likely as a result, Chelmsford was relieved of his command.
Split into simpler sentences: In January 1879 he invaded Zululand (see Anglo-Zulu War), but the centre column of his forces was defeated at the Battle of Isandlwana. Because an invasion of Natal seemed likely as a result, Chelmsford was relieved of his command.