Ethical issues

How can I change this sentence? I would to start with looking back into history.

Reflecting back in history, the Nazi’s misuse and abuse of Jews in particularly for research purposes and forwarding several years, Black African American men used in the Tuskegee experiment were denied treatment for Syphilis.

See example:

Reflecting back in history, the Nazi's misuse and abuse of Jews in particularly for research purposes and forwarding several years, Black African American men used in the Tuskegee experiment were denied treatment for Syphilis.