Complex sentence: Once the specimens have been removed from the body, or the crime scene, they are washed with deionized or tap water and frozen for storage at a temperatures ranging from -20 ° C to 4 ° C until they are needed for analyses.
Split into simpler sentences: Once the specimens have been removed from the body, or the crime scene, they are washed with deionized or tap water. The specimens are then frozen for storage at a temperatures ranging from -20 ° C to 4 ° C until they are needed for analyses.