Complex sentence: The French were militarily successful, constantly defeating the rebels; this, with the reforms of the MRA, contributed to the relative calm of 1970 and 1971, especially in central and eastern Chad, where the French concentrated themselves.
Split into simpler sentences: The French were militarily successful, constantly defeating the rebels. This, with the reforms of the MRA, contributed to the relative calm of 1970 and 1971, especially in central and eastern Chad, where the French concentrated themselves.