Simplify the following text for a Grade 5 native English-speaking person.
Original: The Biblical Mount Sinai ( Hebrew : '' , Har Sinai ) is an unlocated mountain at which the Hebrew Bible states that the Ten Commandments were given to Moses by God .
Simplified: The Biblical Mount Sinai is a mountain that was written about in the Old Testament . It was written by Moses that the Ten Commandments were given to him by God on Mount Sinai .