Simplify the following text for a Grade 4 native English-speaking person.
Original: At the heart of the cave they find an old woman , Hercules sees she is chained up , and is hit over the head by the man , he is really a warlock .
Simplified: At the heart of the cave they find an old woman . Hercules sees she is chained up , and is hit over the head by the man , who is actually a warlock .