Complex sentence: David Prowse has the distinction of being the only actor to have portrayed Frankenstein's monster in more than one Hammer film, the second occasion being "Frankenstein and the Monster from Hell" in 1973, wherein his overall appearance was much more horrifically elaborate.
Split into simpler sentences: David Prowse has the distinction of being the only actor to have portrayed Frankenstein's monster in more than one Hammer film. The second occasion was "Frankenstein and the Monster from Hell" in 1973, wherein his overall appearance was much more horrifically elaborate.