Complex sentence: Her throat had been slit twice from left to right and her abdomen mutilated with one deep jagged wound, several incisions across the abdomen, and three or four similar cuts on the right side caused by the same knife used violently and downwards.
Split into simpler sentences: Her throat had been slit twice from left to right and her abdomen was mutilated by a deep jagged wound. Several shallower incisions across the abdomen, and three or four similar cuts on the right side were caused by the same knife used violently and downwards.