Complex sentence: However, by early 1954 Mary's husband became unhappy with his CIA career and used contacts from his covert operations in Operation Mockingbird to approach several New York publishers for a job but was rebuffed.
Split into simpler sentences: However, by early 1954 Mary's husband became unhappy with his CIA career. He used contacts from his covert operations in Operation Mockingbird to approach several New York publishers for a job but was rebuffed.