Complex sentence: Despite concerns about safety or efficacy and the absence of reliable clinical research, some alternative medicine practitioners give turmeric intravenously, supposedly as a treatment for numerous diseases, in one case causing a death in 2017.
Split into simpler sentences: Despite concerns about safety or efficacy and the absence of reliable clinical research, some alternative medicine practitioners give turmeric intravenously, supposedly as a treatment for numerous diseases. Such treatment caused in one case causing a death in 2017.