Complex sentence: The special effects, which depicted invisibility and other optical illusions, were created by Stanley Horsley, son of cinema pioneer David Horsley who also did the special effects for "The Invisible Man Returns", "The Invisible Woman" and "Invisible Agent".
Split into simpler sentences: The special effects, which depicted invisibility and other optical illusions, were created by Stanley Horsley, son of cinema pioneer David Horsley. He also did the special effects for "The Invisible Man Returns", "The Invisible Woman" and "Invisible Agent".