Complex sentence: The king giving itself brain surgery is a reference to the'Suicide King', the nickname often given to the'King of Hearts' because on a standard pack of cards he is pictured as if driving a sword into his own head.
Split into simpler sentences: The king giving itself brain surgery is a reference to the'Suicide King'. The nickname often given to the'King of Hearts' because on a standard pack of cards he is pictured as if driving a sword into his own head.