Complex sentence: So in 1489, his family home was in Mohill and the chronology strongly suggests the birthplace of Charles must have been Mohill in county Leitrim, in the heartland of "Mág Raghnaill" country.
Split into simpler sentences: So in 1489, his family home was in Mohill. Therefore, the evidence suggests the birthplace of Charles must have been Mohill in county Leitrim, in the heartland of "Mág Raghnaill" country.