Complex sentence: Bunyan returned to Belgium in 1912 to manage Standard Liège, and after a brief spell also managing the Belgian national side, his career was interrupted by the First World War, but he returned to Belgium after the war ended to coach Anderlecht.
Split into simpler sentences: Bunyan returned to Belgium in 1912 to manage Standard Liège, and after a brief spell also managing the Belgian national side. His career was interrupted by the First World War, but he returned to Belgium after the war ended to coach Anderlecht.