The Associated Press MELBOURNE, Australia (AP) – Australian authorities have charged seven people with helping launder hundreds of millions of dollars for a Chinese crime syndicate. Police said Thursday the arrests came after a 14-month investigation that involved multiple Australian agencies and the U.S. Department of Homeland Security. They said it was the most complex money laundering investigation in the nation's history. Police said a money remittance chain in Australia with a dozen outlets, the Changjiang Currency Exchange, was being secretly run by the Long River money laundering syndicate. They said the chain legitimately transferred billions of dollars from regular…