Complex sentence: The Lenape and Wappinger spoke using very similar Delawarean languages--similar enough that a Wappinger speaking in the Munsee Delaware tongue and a Lenape would mostly understand each other.
Split into simpler sentences: The Lenape and Wappinger spoke using very similar Delawarean language. They similar enough that a Wappinger speaking in the Munsee Delaware tongue and a Lenape would mostly understand each other.