Complex sentence: A few mercenaries and former FNLA/UNITA operatives from Angola were also known to have served in the unit, along with former SWAPO guerillas who were given a chance to serve the South African authorities by joining Koevoet's ranks.
Split into simpler sentences: A few mercenaries and former FNLA/UNITA operatives from Angola were also known to have served in the unit at once time or another. In addition, former SWAPO guerillas were given a chance to serve the South African authorities by joining Koevoet's ranks.