Complex sentence: Between November 2009 and the British general election in May 2010, Dannatt served as a defence advisor to David Cameron, resigning when Cameron's Conservative Party won the election, stating that, as prime minister, Cameron should seek defence advice from the incumbent service chiefs.
Split into simpler sentences: Between November 2009 and the British general election in May 2010, Dannatt served as a defence advisor to David Cameron. He resigned when Cameron's Conservative Party won the election, stating that, as prime minister, Cameron should rely on the advice of the incumbent service chiefs.