Complex sentence: A sword in a kofun named Etafunayamakofun had Chinese characters describing Emperor Yūryaku (in kanji), Historian Wakatakeru has suggested that this area was under the control of Yamato Ouken.
Split into simpler sentences: A sword in a kofun named Etafunayama kofun had Chinese characters describing Emperor Yūryaku. Because of this, historian Wakatakeru has suggested that this area was under the control of Yamato Ouken.