Complex sentence: The majority went to the Randfontein Estates Gold Mining Company (REGM), while two were sold to the Hotham Valley Railway in Western Australia where they were to haul tourists in ex SAR passenger coaches.
Split into simpler sentences: The majority went to the Randfontein Estates Gold Mining Company (REGM). Two were sold to the Hotham Valley Railway in Western Australia where they were to haul tourists in ex SAR passenger coaches.