Original: On 29 July 2009, BMW announced that they would leave Formula One at the end of 2009, which made Kubica a free agent for the season. For the 2010 season, it was announced that he had signed for Renault F1, the team he tested for during his junior career.
Simplified: After BMW announced they were leaving Formula 1 in 2009, Kubica joined the French team Renault F1.