Complex sentence: He served as chairman and managing director of Holden, the Australasian General Motors (GM) operation from 1 February 2008 until 1 September 2009, overseeing GM's Australasian operations and is a director on the GM Asia Pacific Strategy Board.
Split into simpler sentences: He served as chairman and managing director of Holden, the Australasian General Motors (GM) operation. Effective, 1 February 2008, Reuss oversees GM's Australasian operations and is a director on the GM Asia Pacific Strategy Board.