Complex sentence: In July 2014, Channing Tatum, Ralph Fiennes, Tilda Swinton, and Jonah Hill were cast, and Scarlett Johansson entered talks to portray "an actress who suddenly becomes pregnant as her film is about to go into production".
Split into simpler sentences: In July 2014, Channing Tatum, Ralph Fiennes, and Tilda Swinton were cast, while Jonah Hill and Scarlett Johansson entered talks to join the production. Johansson would portray "an actress who suddenly becomes pregnant as her film is about to go into production".