Complex sentence: Nowadays Hungarian Grey cattle are kept mainly as tourist attractions in the Hortobágy National Park and other Hungarian national parks, but serve also as gene banks, due to their reported resistance to cattle diseases which affect more highly bred cattle types.
Split into simpler sentences: Nowadays Hungarian Grey cattle are kept mainly as tourist attractions in the Hortobágy National Park andother Hungarian national parks. These herds serve as gene banks, due to their reported resistance to cattle diseases which affect more highly bred cattle types.