Simplify the following text for a Grade 9 native English-speaking person.
Original: The original Iroquois League was often known as the Five Nations , as it was composed of the Mohawk , Oneida , Onondaga , Cayuga and Seneca nations .
Simplified: The first Iroquois League was often known as the Five Nations , as it was made up of the Mohawk , Oneida , Onondaga , Cayuga and Seneca .