Complex sentence: Layard, with Clark's help, set about campaigning for a new national CBT service, which was accepted by the newly re-elected Labour goverment in 2005 and put into practice by Clark.
Split into simpler sentences: Layard, with Clark's help, set about campaigning for a new national CBT service. The plan was accepted by the newly re-elected Labour goverment in 2005 and put into practice by Clark.