Complex sentence: She got Sabich's fingerprints on them and, after killing Polhemus, set up other evidence in order to make it look like a man attacked and raped her including sperm she saved in a basement freezer after having intercourse with Sabich.
Split into simpler sentences: She got Sabich's fingerprints on them and, after killing Polhemus, set up other evidence in order to make it look like a man attacked and raped her. Barbara saved the sperm in a basement freezer after having intercourse with Sabich.