Complex sentence: Mathews began her career with Microsoft in 1989 as a consultant in the U.K. She later joined Microsoft in 1993 to lead its Corporate Public Relations function and was named an officer of the corporation in 1999.
Split into simpler sentences: Mathews began her career with Microsoft in 1989 as U.K. consultant. Later she joined Microsoft in 1993 in order to lead its Corporate Public Relations function and was named an officer of the corporation in 1999.