Complex sentence: The station was operated non-commercially and voluntarily by the Otago Radio Association until 1990, became a commercial station and was sold to Radio Otago Limited in 1993, and subsequently became part of MediaWorks Radio.
Split into simpler sentences: The station was operated non-commercially and voluntarily by the Otago Radio Association until 1990. Then it became a commercial station and was sold to Radio Otago Limited in 1993, and subsequently became part of MediaWorks Radio.