Complex sentence: Croatian partisans had their autonomy along with the Slovene and Macedonian partisans, however, on 1 March 1945 they were put under the command of Supreme Command of the Yugoslav Army, thus losing their autonomy.
Split into simpler sentences: Croatian partisans had their autonomy along with the Slovene and Macedonian partisans. However, on 1 March 1945 they were put under the command of Supreme Command of the Yugoslav Army, thus losing their autonomy.