Complex sentence: Jaap de Hoop Scheffer attended the economic conference in Montreal, Canada on June 21,2007, where he encouraged Canada to continue its military mission in Afghanistan past its 2009 withdrawal date.
Split into simpler sentences: Jaap de Hoop Scheffer attended at economic conference in Montreal, Canada on June 21,2007. While there he encouraged Canada to continue its military mission in Afghanistan past its 2009 withdrawal date.