Complex sentence: Piroska Joachim's brother Attila JOACHIM (1923-1947) died later in 1947 due to accumulated internal bodily injuries caused by repeated beatings during the Budapest holocaust and he also would certainly have been aware and conscious of the murders of his mother's family members.
Split into simpler sentences: Piroska Joachim's brother Attila Joachim died later in 1947 due to accumulated internal bodily injuries caused by repeated beatings during the Budapest Holocaust. He also would certainly have been aware and conscious of the murders of his mother's family members.