Complex sentence: Emperor Wu did not listen to him, and in fact made him the coordinator of the six-pronged attack; when Jia declined, Emperor Wu told him to coordinate anyway--or otherwise Emperor Wu himself would personally coordinate.
Split into simpler sentences: Emperor Wu did not listen to him, and in fact made him the coordinator of the six-pronged attack. When Jia declined, Emperor Wu told him to coordinate anyway, or otherwise Emperor Wu himself would personally coordinate.