Complex sentence: On February 4,2011, Canadian Prime Minister Stephen Harper and U.S. President Barack Obama announced a new security and prosperity initiative with plans to "pursue a perimeter approach to security in ways that support economic competitiveness, job creation, and prosperity".
Split into simpler sentences: On February 4,2011, Canadian Prime Minister Stephen Harper and US President Barack Obama announced a new security and prosperity initiative. In it they planned to "to pursue a perimeter approach to security in ways that support economic competitiveness, job creation, and prosperity".