Complex sentence: In addition, Walker was the chief strategist and tactician for "Project C", the detailed plan for confrontation with local police and city officials that was the heart of the first phase of the Birmingham Campaign in 1963.
Split into simpler sentences: In addition, Walker was the chief strategist and tactician for "Project C". He developed the detailed plan for confrontation with local police and city officials that was the heart of the Birmingham Campaign in 1963.