BATON ROUGE - A Denham Springs man who owns a business in Livingston Parish and has been in the U.S. since 1993 is the target of a recent federal denaturalization case, The Advocate reported Monday. Court documents show that prosecutors in Louisiana's Middle District have filed to revoke naturalization status for 68-year-old Nachhatar Singh on Aug. 27. The newspaper said Singh arrived in the U.S. from India in 1993 as Sawaran Singh, but then cha…