Complex sentence: On January 31,2005 he announced he was defecting to the breakaway party Veritas party, along with fellow UKIP Assembly member Damian Hockney; he proceeded to leave it along with Hockney to form One London on September 1,2005.
Split into simpler sentences: On January 31,2005 it was announced that he was defecting to the breakaway party Veritas party, along with fellow UKIP Assembly member Damian Hockney. On September 1 Hulme-Cross defected from Veritas along with Hockney to form One London on September 1,2005.