Complex sentence: Blue ice, in the context of aviation, is frozen sewage material leaked mid-flight from commercial aircraft lavatory waste systems, a biowaste mixture of human waste and liquid disinfectant that freezes at high altitude.
Split into simpler sentences: Blue ice, in the context of aviation, is frozen sewage material that has leaked mid-flight from commercial aircraft lavatory waste systems. It is a mixture of human biowaste and liquid disinfectant that freezes at high altitude.