Complex sentence: The Harman Kardon receiver group was the heart of Harman International and in 1985 he was able to purchase the receiver group and return Harman International to its pre- 1976 form.
Split into simpler sentences: The Harman Kardon receiver group was the heart of the Harman International. In 1985 he was able to buy back the receiver group and return Harman International to its pre 1976 form.