Complex sentence: She refused to plead to the case so as to prevent a trial that would entail her children being made to testify and therefore they would be tortured, and she was executed by being crushed to death--the standard punishment for refusal to plead.
Split into simpler sentences: She refused to plead to the case so as to prevent a trial that would entail her children being made to testify, and therefore being subjected to torture. As a result she was executed by being crushed to death--the standard punishment for refusal to plead.