Complex sentence: In 1935, John D. MacArthur purchased Bankers Life and Casualty for $2,500, and using mass marketing techniques to sell insurance through the mail, this company was the basis for his phenomenal business success in Real Estate and Insurance.
Split into simpler sentences: In 1935, John D. MacArthur purchased Bankers Life and Casualty for $2,500, and used mass marketing techniques to sell insurance through the mail. Banker's Life was the basis for John's phenomenal business success in Real Estate and Insurance.