Complex sentence: The owner of the mine, Joachim Prinsloo, had sold land to both gold and diamond prospectors before and would not sell, but Cullinan succeeded in purchasing the land for £52,000 from Prinsloo's daughter, who inherited the farm after her father's death.
Split into simpler sentences: The owner of the mine, Joachim Prinsloo, had sold land to both gold and diamond prospectors before, and would not sell. However Cullinan succeeded in purchasing the land for £52,000 from Prinsloo's daughter, who inherited the farm after her father's death.