Complex sentence: A preliminary round was held in order to reduce the number of teams competing in the next round to 32 and featured bottom 9 teams from 2011--12 Serbian First League, as well as 5 regional cup winners.
Split into simpler sentences: A preliminary round was held in order to reduce the number of teams competing in the next round to 32. Appearing in this round were bottom 9 teams from 2011--12 Serbian First League, as well as 5 regional cup winners.