Complex sentence: Coincidences in these cycles have an important numerical and mystical meaning, coincidence being an important part of the Javanese aesthetic, as for example the use of seleh in Javanese music.
Split into simpler sentences: Coincidences in these various cycles have an important numerical and mystical meaning to the Javanese. Coincidence is indeed an important part of the Javanese aesthetic, as for example the use of seleh in Javanese music.