Complex sentence: During this time he continued to work in film writing "The Beast From 20,000 Fathoms" in 1953 which is listed as one of the primary inspirations for "Godzilla".
Split into simpler sentences: During this time he continued to work in film writing "The Beast From 20,000 Fathoms" released in 1953. It was listed as one of the primary inspirations for "Godzilla".