Complex sentence: The first spell of September hit the already inundated parts of province on 2 September, thereafter the second spell hit on 5 September, and the third on 9 September, and fourth on 12 September 2011.
Split into simpler sentences: The first spell of September hit the already inundated parts of the province on 2 September. Thereafter, the second spell hit on 5 September, the third on 9 September, and the fourth on 12 September 2011.