Simplify the following text for a Grade 9 native English-speaking person.
Original: The Iroquois refer to themselves as the `` Haudenosaunee '' , which means `` People of the Longhouse , '' or more accurately , `` They Are Building a Long House . ''
Simplified: The Iroquois call themselves the `` Haudenosaunee '' , which means `` People of the Longhouse , '' or more accurately , `` They Are Building a Long House . ''