Complex sentence: Cuny's family believes that although they were contact with the Chechen forces under Dzhokhar Dudayev who were meant to pass them on for safe keeping, they were arrested and executed under the orders of Rizvan Elbiev, a local Chechen counterintelligence commander.
Split into simpler sentences: Cuny's family believes that although they were contacted by Chechen forces under Dzhokhar Dudayev who were meant to pass them on for safe keeping. However, they were instead arrested and executed under the orders of Rizvan Elbiev, a local Chechen counterintelligence commander.