Complex sentence: Upon the release of the final autopsy, Plano police chief Bruce Glasscock was quoted as saying that it was Tuinei's first experience with heroin although he did not elaborate how that determination was made.
Split into simpler sentences: Upon the release of the final autopsy, Plano police chief Bruce Glasscock was quoted as saying that it was Tuinei's first experience with heroin. Glasscock did not elaborate how that determination was made.