Complex sentence: In November 2009, Tennis Canada hired recently retired former player Frédéric Niemeyer to coach Raonic and travel with him for 18 weeks during the 2010 season.
Split into simpler sentences: In November 2009, Tennis Canada hired recently retired former player Frédéric Niemeyer to coach Raonic. Niemeyer agreed to travel with Raonic for 18 weeks during the 2010 season.