Simplify the following text for a Grade 4 native English-speaking person.
Original: The MÄ ori name for the bay is Te Moana-a-Toi ( `` the sea of Toi '' ) , a reference to the ancestral explorer Toi-te-huatahi .
Simplified: The MÄ ori name for the bay is Te Moana-a-Toi ( `` the sea of Toi '' ) .