Simplify the following text for a Grade 4 native English-speaking person.
Original: A French dip sandwich , also known as a beef dip , is a hot sandwich consisting of thinly sliced roast beef ( or , sometimes , other meats ) on a `` French roll '' or baguette .
Simplified: The French dip sandwich is a popular dish . It is a sandwich , usually on French bread , with roast beef on the inside .