Complex sentence: Perkins resigned from HP's board on May 18,2006 over the actions taken by the board's chair, Patricia C. Dunn, to ferret out the board-level source of media leaks using methods Perkins considered unethical and possibly illegal.
Split into simpler sentences: Perkins resigned from HP's board on May 18,2006. However, Perkins reportedly resigned over the actions taken by the board's chair, Patricia C. Dunn, to ferret out the board-level source of media leaks using methods Perkins considered unethical and possibly illegal.