Complex sentence: There remained only one thing in their way and that was Crvenka to beat then they would certainly be in the First League, but Sloga did not have the luck to get past their opponents and the First League remained an unfulfilled wish.
Split into simpler sentences: There remained only one thing in their way and that was Crvenka. To beat then they would certainly be in the First League, but Sloga did not have the luck to get past their opponents and the First League remained an unfulfilled wish.