Complex sentence: The number of people who died later as the result of injuries sustained under torture is unknown and estimates concerning the number killed at the time also vary, ranging from 21 to 91, including up to 70 who simply "disappeared".
Split into simpler sentences: The number of people who died later as the result of injuries sustained under torture is unknown. Estimates concerning the number killed at the time also vary, ranging from 21 to 91, including up to 70 who simply "disappeared".