Complex sentence: The film gives major roles to some actors who might have been considered "has-beens" at the time: the leads were Steve Brodie and Barbara Hale, with roles of some size going to Alan Hale, Jr. and Leslie Parrish.
Split into simpler sentences: The film gives major roles to some actors who might have been considered "has-beens" at the time. The leads were Steve Brodie and Barbara Hale, with other roles going to Alan Hale, Jr. and Leslie Parrish.