Complex sentence: Shields attended Christ the King, a Roman Catholic primary school, which he described as "a really horrible school run by psychopathic nuns" and lived in Flushing, a neighbourhood in north-central Queens.
Split into simpler sentences: Shields attended Christ the King, a Roman Catholic primary school, which he described as "a really horrible school run by psychopathic nuns". They lived in Flushing, a neighbourhood in north-central Queens.