Simplify the following text for a Grade 7 native English-speaking person.
Original: Karloff played Frankenstein 's monster in two other films , Bride of Frankenstein ( 1935 ) and Son of Frankenstein ( 1939 ) , which also featured Lugosi .
Simplified: Karloff returned to the character of the monster in Bride of Frankenstein ( 1935 ) , and Son of Frankenstein ( 1939 ) .