Complex sentence: Researchers disagree about the nature of distress and impairment in people with GID, with some believing people with GID suffer solely because they are stigmatized and victimized, and saying that in societies with less-strict gender divisions, transsexuals suffer less.
Split into simpler sentences: Researchers disagree about the nature of distress and impairment in people with GID. Some have suggested that people with GID suffer because they are stigmatized and victimized; if the society had less-strict gender divisions, transsexuals would suffer less.