Complex sentence: She radically reduced her playing schedule for 1970, playing in South Africa successfully (winning both the Orange Free State Championships and the Western Province Championships), but then largely playing only events in the United Kingdom (UK) for the remainder of the year.
Split into simpler sentences: She radically reduced her playing schedule for 1970, playing in South Africa where she won the Orange Free State Championships and the Western Province Championships. She then largely played only events in the United Kingdom for the remainder of the year.