Complex sentence: An autopsy revealed "significant heart disease" and that his heart and liver weighed over twice the average amount of an adult male but was ultimately inconclusive on cause and manner of death due to the hospital discarding his admission blood samples.
Split into simpler sentences: An autopsy revealed "significant heart disease" and that his heart and liver weighed over twice the average amount for an adult male. However the autopsy was ultimately inconclusive on cause and manner of death due to the hospital discarding his admission blood samples.