Complex sentence: RKO shopped the project around, and it was completed by an independent film unit and released in the U.S. in December of 1952 with writing credits attributed to others and no mention of Wray's original screenplay.
Split into simpler sentences: RKO shopped the project around and it was completed by an independent film unit. It was released in the U.S. in December of 1952 with writing credits attributed to others and no mention of Wray's original screenplay.