Complex sentence: Leung claimed that he had decided on the tax increase after buying the car, news of the car purchase sparked fury at Leung's conflict of interest, and concerns over his integrity for failing to declare his purchase to Exco.
Split into simpler sentences: Leung claimed that he had decided on the tax increase after buying the car. News of the car purchase sparked fury at Leung's conflict of interest, and concerns over his integrity for failing to declare his purchase to Exco.