Complex sentence: After the prisoners were killed by tearing their hearts out in a ritual sacrifice, the rest of the body was chopped and cooked with corn, the meal was shared among the whole community as an act of religious communion.
Split into simpler sentences: After the prisoners were killed by having their hearts torn out in a ritual sacrifice, the rest of the body was chopped and cooked with corn. The meal was shared among the whole community as an act of religious communion.