Original sentence: He worked hard on little but to increase his personal fortune, which in 1984 was estimated to amount to US$5 billion, most of it in Swiss banks (however, many now suspect he was never a billionaire at all)
Edited sentence: He worked hard on little but to increase his personal fortune, which in 1984 was estimated to amount to US$5 billion, most of it in Swiss banks (however, a comparatively small $3.4 million has been found after his ousting )