Complex sentence: Roger Bacon was born in Ilchester in Somerset, England, in the early 13th century, although his date of birth is sometimes narrowed down to, "1213 or 1214", or "1214 or 1215", however historians most agree on.
Split into simpler sentences: Roger Bacon was born in Ilchester in Somerset, England, in the early 13th century. Although his date of birth is sometimes narrowed down to, "1213 or 1214", or "1214 or 1215", however historians most agree on.