Complex sentence: It was common practice during the Middle Ages for both Christian and Muslim rulers to tie their bloodline back to a pivotal figure in their faith's history, so the lineage of the Keita dynasty may be dubious at best.
Split into simpler sentences: It was common practice during the Middle Ages for both Christian and Muslim rulers to tie their bloodline back to a pivotal figure in their faith's history. So while the lineage of the Keita dynasty may be dubious at best.