Complex sentence: In 1959 Gene Autry's Golden West Broadcasters would add KVI to its portfolio, where under its ownership would bring to the market a very successful Personality Adult Contemporary format in 1964.
Split into simpler sentences: In 1959 Gene Autry's Golden West Broadcasters would add KVI to its portfolio. In 1964 it brought to market a very successful Personality Adult Contemporary format in 1964.