Complex sentence: There were several Native American tribes located around Hummelstown, including the Susquehannocks, the Iroquois, and several smaller tribes that would later be conquered or assimilated into the Iroquois.
Split into simpler sentences: There were several Native American tribes located around Hummelstown. The Susquehannocks, the Iroquois, and several smaller tribes that would later be conquered or assimilated into the Iroquois.