Complex sentence: The Division launched the attack on 20 January with its 749 Regiment and elements of the 202nd Tank Battalion, with the air support, but it was halted by 1st and a battalion of 7th Krajina Brigade some 10 km south from Sanski Most.
Split into simpler sentences: The Division launched the attack on 20 January with its 749 Regiment and elements of the 202nd Tank Battalion. Despite air support, it was halted by the 1st Krajina and one battalion of 7th Krajina Brigade some 10 km south from Sanski Most.