Complex sentence: In March 2012, SNC Lavalin's chief executive officer Pierre Duhaime resigned and was replaced by company director Ian Bourne, who is also is the Chairman of Ballard Power Systems and a member of the CPP Investment Board.
Split into simpler sentences: In March 2012, SNC Lavalin's chief executive officer Pierre Duhaime resigned and was replaced by company director Ian Bourne. Mr. Bourne is the Chairman of Ballard Power Systems and a member of the CPP Investment Board.