Complex sentence: Gajdusek's father, Karol Gajdusek, was from Büdöskö, Kingdom of Hungary, now Smrdáky, Slovakia and was an ethnic slovak who was a butcher and his maternal grandparents, ethnical hungarians of the calvinist faith, the Dobrockis, immigrated from Debrecen, Hungary.
Split into simpler sentences: Gajdusek's father, Karol Gajdusek, was from Büdöskö, Kingdom of Hungary, now Smrdáky, Slovakia and was an ethnic slovak who was a butcher. His maternal grandparents, ethnical hungarians of the calvinist faith, the Dobrockis, immigrated from Debrecen, Hungary.