Complex sentence: Bugac is the part of the Kiskunsagi National Park Kiskunsagi Nemzeti Park which is the second national park of Hungary, founded in 1975, after establishment of the Hortobágy National Park in 1973.
Split into simpler sentences: Bugac is the part of the Kiskunsagi National Park which is the second national park of Hungary, founded in 1975. The first national park was of the Hortobágy National Park in 1973.