Complex sentence: He was briefly the Chief Secretary to the Treasury, holding office for 17 days in 2010 before resigning due to his Parliamentary expenses claims, on disclosure of which he was suspended from Parliament by vote of the House of Commons.
Split into simpler sentences: He was briefly Chief Secretary to the Treasury, holding office for 17 days in 2010. However he resigned because of his Parliamentary expenses claims, on disclosure of which he was suspended from Parliament by vote of the House of Commons.