Complex sentence: The American Indians were led by Little Turtle of the Miamis, Blue Jacket of the Shawnees, and Buckongahelas of the Delawares (Lenape), who led his 480 men to join the 700 warriors of Little Turtle and Blue Jacket.
Split into simpler sentences: The American Indians were led by Little Turtle of the Miamis, Blue Jacket of the Shawnees, and Buckongahelas of the Delawares (Lenape). Buckongahelas led his 480 men to join the 700 warriors of Little Turtle and Blue Jacket.