Complex sentence: The Martin Agency was founded in Richmond, Virginia in 1965 by David N. Martin and George Woltz and was independently owned until 1986, when it was acquired by Scali, McCabe & Sloves Advertising of New York.
Split into simpler sentences: The Martin Agency was founded in Richmond, Virginia in 1965 by David N. Martin and George Woltz. The agency was independently owned until 1986, when it was acquired by Scali, McCabe & Sloves Advertising of New York.