Simplify the following text for a Grade 7 native English-speaking person.
Original: Dalai Lama is the title of Tibetan Buddhism leader . `` Dalai '' is original from Mongolian which means `` ocean '' and `` Lama '' is original from Tibetan which means `` the highest principle '' .
Simplified: The very name of each Dalai Lama from the Second Dalai Lama onwards had the word Gyatso ( in it ) , which means `` ocean '' in Tibetan .