Complex sentence: Money and accounting work in both the world with which we are familiar-and a covert world we don't see.The "money" in money laundering-the "money" that results from crime-never ceases to be "legal tender".
Split into simpler sentences: Money and accounting work in both the world with which we are familiar-and a covert world we don't see. The money in "money laundering"-the money that results from crime-never ceases to be "legal tender".