Complex sentence: But due to lacking of trainer, he was send back to Mashhad and started training in garrisons.although he attached great importance to training, it was really hard for him not to attend the war directly, so he decided to go to Kurdistan province to oppose counter-revolution.
Split into simpler sentences: But due to lacking of trainer, he was sent back to Mashhad and started training in garrisons. Although he attached great importance to training, it was really hard for him not to attend the war directly, so he decided to go to Kurdistan province to oppose counter-revolution.