Complex sentence: At the time Jackie had declared annual earnings of $263,000, while the average salary a man earned then was just $5,000 a year, but he discovered that, despite being at the peak of success, he was broke.
Split into simpler sentences: At the time Jackie had declared annual earnings of $263,000, while the average salary a man earned then was just $5,000 a year. But he discovered that, despite being at the peak of success, he was broke.