Simplify the following text for a Grade 12 native English-speaking person.
Original: The Yalukit-willam were one clan in a language group known as the Bunurong , which included six clans along the coast from the Werribee River , across the Mornington Peninsula , Western Port Bay to Wilsons Promontory .
Simplified: The Yalukit-willam were part of the Bunurong , a language group of six clans along the coast from the Werribee River , to the Mornington Peninsula , Western Port Bay and Wilsons Promontory .