Simplify the following text for a Grade 6 native English-speaking person.
Original: A.H. Ewen surmised that the rock 's name meant `` large rock at the edge '' from the Norman language Or ( edge ) + Etac ( Stack ) .
Simplified: A.H. Ewen thinks that the rock 's name meant `` large rock at the edge '' from the Norman language Or ( edge ) + Etac ( Stack ) .