Complex sentence: Brooke Shields became attached to the project as Caroline, Jonny's mother, about a month before her shooting began and described herself as "honored" to be working with Bill Nighy who was cast as her on--screen husband, Richard.
Split into simpler sentences: Brooke Shields became attached to the project as Caroline, Jonny's mother, about a month before her shooting began. Shields described herself as "honored" to be working with Bill Nighy who was cast as her on--screen husband, Richard.