Complex sentence: First there were only a few festival stands (with show men and beer tents), but by 1860 the arrangement of three main streets and numerous side streets, as today, was introduced, in order to cope with the ever increasing number of visitors.
Split into simpler sentences: First there were only a few festival stands (with show men and beer tents). Already 1860 the arrangement into three main streets and numerous side streets, as today, was introduced, in order to cope with the ever increasing number of visitors.