 Complete the following phrase:  Team Mercedes GP hired German drivers Nico Rosberg, and seven-time world champion Michael Schumacher, who returned to Formula One after a three-year absence, and Nick Heidfeld as the test and reserve driver. Of Brawns 2009 drivers, Jenson Button signed for McLaren, whilst Rubens Barrichello moved to Rosbergs former seat with Williams team for 2010. With the acquisition of Brawn, the team ended its involvement with McLaren, parent company Daimler AG sold back the 40 shareholding in the McLaren Group, while continuing to supply engines to the team. The teams performance during 2010 was not so competitive as under Brawn, with the team behind the leading three teams of Ferrari, McLaren, and Red Bull. Their best results came from Rosberg finishing on the podium three times, scoring third places at Sepang, 