Complex sentence: In 1998, Crawford was one of eight NBA referees charged with filing false income tax returns after an Internal Revenue Service investigation found that cash was being pocketed by referees when airline tickets provided by the league were downgraded.
Split into simpler sentences: In 1998, Crawford was one of eight NBA referees charged with filing false income tax returns. An Internal Revenue Service investigation was the result of cash being pocketed by referees when airline tickets provided by the league were downgraded.