Complex sentence: The word stems from the Afrikaans word "kommando", which translates roughly to "mobile (originally by horse) infantry regiment" (in other words, a mounted infantry regiment), who fought against the British Army in the first and second Boer Wars.
Split into simpler sentences: The word stems from the Afrikaans word "kommando", which translates roughly to "mobile infantry regiment". Origianlly referring to mounted infantry regiment, who fought against the British Army in the first and second Boer Wars.