Original sentence: The Yugoslav resistance forces were initially divided into two guerrilla armies: the communist-led Yugoslav Partisans, and the royalist Chetnik movement (known officially as the Yugoslav Army in the Fatherland), while the latter increasingly collaborated with the Axis and lost its international recognition as a resistance force
Edited sentence: However, the Chetniks did continue to attack axis forces, and they were never in an official alliance with them.The Yugoslav resistance forces were initially divided into two guerrilla armies: the communist-led Yugoslav Partisans, and the royalist Chetnik movement (known officially as the Yugoslav Army in the Fatherland), while the latter increasingly collaborated with the Axis in their fight against the communist Partizans.This lost them allied support of having the status of preferred resistance force