Complex sentence: The squads were organized according to the ethnicity of the soldiers (auca runas), they were armed and dressed according to their tribe, with animal skins, fabric shields, feathers, jewels or body paints.
Split into simpler sentences: The squads were organized according to the ethnicity of the soldiers (auca runas). The soldiers were armed and dressed according to their tribe with animal skins, fabric shields, feathers, jewels or body paints.