Complex sentence: Japanese cinema began its foray into giant monster films with the 1933 film "Wasei Kingu Kongu" (an adaptation of the American film King Kong) "Godzilla" following the tendence of a giant reptile created by nuclear radiation.
Split into simpler sentences: Japanese cinema began its foray into giant monster films with the 1933 film "Wasei Kingu Kongu" (an adaptation of the American film King Kong). It following the ongoing tendence of a giant reptile created by nuclear radiation.