Complex sentence: On 31 March, Iraqi security forces established fire-control over the city and seized the Salaheddin provincial government headquarters and the Tikrit hospital as they were moving towards the presidential complex.
Split into simpler sentences: On 31 March, Iraqi security forces established fire-control over the city. Soon afterwards, the Iraqi security forces advanced into the cite center, seizing the Salaheddin provincial government headquarters and the Tikrit hospital, as they moved towards the presidential complex.