Simplify the following text for a Grade 11 native English-speaking person.
Original: On 4 September 2009 Farage resigned as leader of UKIP to concentrate on his campaign to become Member of Parliament for Buckingham at Westminster in the 2010 general election .
Simplified: In November 2009 , Farage resigned as UKIP leader because he wanted to concentrate on being elected to the House of Commons at the 2010 General Election .