Complex sentence: These days if you were to go to Japan you would rarely see these kimonos unless you happened to get there at the time of a festival, you are more likely to see the more modern western clothing on the Japanese while you are visiting.
Split into simpler sentences: These days if you were to go to Japan, you would rarely see kimonos unless you happened to get there at the time of a festival. You are more likely to see modern western clothing on the Japanese while you are visiting.