Complex sentence: Because the text is based on a historical framework, it remains highly useful to historians for the study of the late New Kingdom and early Third Intermediate Period who often treat the text as a primary source of the late 20th Dynasty.
Split into simpler sentences: Because the text is based on a historical framework, it remains particularly useful to historians for the study of the late New Kingdom and early Third Intermediate Period. They often treat the text as a primary source of the late 20th Dynasty.