Complex sentence: He held the position of CEO of ASEA 1980-87, was CEO of Asea Brown Boveri (ABB) 1988-1996, chairman of Investor AB 1997-2002, and chairman of AstraZeneca from 1999 to 2005.
Split into simpler sentences: He held the position of CEO of ASEA 1980-87, was CEO of Asea Brown Boveri (ABB) 1988-1996. Barnevik was chairman of the board of Investor AB 1997-2002, and chairman of AstraZeneca from 1999 to 2005.