Complex sentence: Simocatta, Menander, and Priscus provide evidence that the Xionites were different from the Hephthalites although, Frye suggested that the Hepthalites may have been a prominent tribe or clan of the Xionites.
Split into simpler sentences: Simocatta, Menander, and Priscus provide evidence that the Xionites were different from the Hephthalites. Although, the Hepthalites may have been a prominent tribe or clan of the Xionites.