Complex sentence: Joining the Conservatives, he was elected as MP for Henley in 2001 and under Conservative leaders Michael Howard and David Cameron he served on the Shadow Cabinet as Minister for Culture, Communications and Creative Industries and then for Higher Education.
Split into simpler sentences: Joining the Conservatives, he was elected to the House of Commons as MP for Henley in 2001. Under Conservative leaders Michael Howard and David Cameron, Johnson served on the Shadow Cabinet as Minister for Culture, Communications and Creative Industries and then for Higher Education.