Complex sentence: The remaining 49% of Unipart Automotive was retained by Unipart Group for no reason other than to watch it burn as a condition of the sale was that Unipart Group exercised no control over the business.
Split into simpler sentences: The remaining 49% of Unipart Automotive was retained by Unipart Group. A condition of the sale was that Unipart Group exercised no control over the business.