Complex sentence: Kilty was bitter about his treatment by British Athletics officials who selected the UK team for the 2012 London Olympics and deliberately left him off Team GB and, later that year, eliminated funding his training-which was his only source of income.
Split into simpler sentences: Kilty was bitter about his treatment by British Athletics officials who selected the UK team for the 2012 London Olympics. They deliberately left him off Team GB and, later that year, eliminated funding for his training-which was his only source of income.